Solution to Seasonal Fair by Azed

'TV' link word; Christmas.

Themes: A pudding (synonyms of pud, ding), B card (eponymous hero of Arnold Bennett's The Card). C box (owners of boxes, see Brewer's Phrase & Fable), D rose (synonyms).

Across 1. upped 6. chasuble (ch + anag.) 12. naos (cell) 13. sontag 14. snaked 15. pudding 17. daimio (peer) 18. mailes 19. roum 21. stob (awl) 23. dash 25. Southcott 26. card 30. beer 32 rill ((g)rill) 33. ordeal (test) 36. cohort 38. lomenta 39. machin 41. Osiris (god) 42. hied 43. rebelled 44. Denry

Down  2. Pandora 3. poa 4. eskimo (pole, top vb.) 5. deem 6. codist 7. hypothecate (pledge) 8. undid 10. lane (road)11. eggshell 13. sumo 16. tricolor (flag loci in rort (all rev.)) 20. nub 22. box 24. saltire 26. cromed (hooked) 27. troche 29. deere (sv. dear (2)) 31. elts (sows) 34. rose 35. anil 37. hand 40 hin (hin(t)