Alchemy by Scribbler

An alchemist's performed his magic on seven of the entries. He's also 27ed the definition portion of all Across clues.

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ACROSS: 
1. Lad's awake, though exhausted (6) 
6. Abe's game, though a cheap beau, they say (6) 
9. Hanged entries! (13) 
11. Laws of the French: one must accept the obnoxious Gaul (7) 
13. Angry curse delivered on East Ave. (6) 
15. "Ed Bush, product of the Bronx: Welcome." (6)
17. Eeling: nothing many want to get into, that's the gist (4) 
19. A tasty bird is the owl (3) 
20. Ill, i.e., running nose with a touch of laryngitis (5) 
24. The English Sea can kill (4) 
25. Ate R.N; was once a model (4) 
26. I wing through descents with true recklessness (8) 
28. Hale, like Quasimodo (8) 
31/46. Actors our alchemist employs to create 37 get low honors from the audience (4, 6) 
32. Art of the neck: sleep with Elizabeth the First (4) 
33. Both an Opera House and High School offer a choice of ramps (5) 
35. 'esitation's at 'er end, 'iram (3) 
37. Re the score in Barcelona - it was by the Dutch (4) 
39. Ex-City teams play for a dram (9) 
42. Election that turns against Graybeards: a pearl is put in (6) 
43. Eggy joint? With it, dogfood's served (7) 
45. Urning: 31/46 into 37 (13) 
47. Ten aboard ship take the first tea - they set the tone (6) 		 DOWN:
1. Overbearing fosterage (10)
2. Jehosaphat's general didst deliver an uprising (5)
3. Solvent gives a high to rubber worker... (6)
4. ...this liquid often leads to a high time (3)
5. A rabbit chattered with some elk (4)
6. Young swimmer didn't lose her head (4)
7. Mick, Don, and Daisy's boss? (6) 
8. All Washington bills have a lack of 35 (4)
10. Thin plate produced with the formula (x/y)e (5)
12. Look, without you, I might speak Nilotic (3)
14. Take the measure of directors in the Cabinet (8)
16. It will ram the French six times (8)
18. Improved soldiers lead the advance (10)
21. French League takes position on the European Union's rise (5)
22. Piece of furniture makes loud sound when toppling (5)
23. Diminutive computer wizard shows an engineer how to get into PRINT (1-4)
29. Destination for Pilgrims Progress (the very same) is National Academy (6)
30. It's morning, Jenny, or so I gather (5)
31. "The Goddess of Phoenecia" is a Yankee legend (6)
34. Roman treasure brought up from the deep (3)
36. The grinder guy is so upsetting... (5)
38. ...so upsetting, a beast of mythical proportion (4)
40. Many, and then many more sounds of enjoyment (4)
41. A small cabin that is close (4)
44. "The sex is over, Sister. In one word, this thing's possessive." (3)

To enter the Competition send your answers to derek@puzzles.freenetname.co.uk and write a clue (in the same style as the other across clues) to the unclued entry at 27 across before 28 February. The writer of the best clue will receive a copy of Chambers Crossword Dictionary.