Christmas Puzzle

[chamberla1n]

Having difficulties in completing the Christmas Puzzle in the Christmas Radio Times. I may have gone wrong along the way.
11a) Unjustifiable street lightning? (3,5,3,6) ?o? w,r?? ?m? c?n?l?
12a) Loud and jaunty tree topper (5) ?a???
56a) Gas supply courses ?(5) m?i?a
10d) Vegetable from City pours out to Junction (8,6) ???s?e?s ?p?o?t

Thanking you all for your assistance and wishing you all Happy Christmas and a Healthy New Year

[Neveracrossword]

10 Brussels Sprout

[elliemay1]

12 f airy

[elliemay1]

56 mains

[elliemay1]

11 are you sure of those letters?
last word could be 'candle'

[geevo41]

the saying is

not worth the candle

[TheWinner]

well done geevo41.

[Mamyalynne]

11 Was asked with a slightly different clue earlier this month.

https://www.theanswerbank.co.uk/Quizzes-and-Puzzles/Crosswords/Question1776737.html