Works a wedding (6)
I believe the answer is:
caters
'works a wedding' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for caters that I've seen before include "'Supplies food, ready to eat (6)'" , "Does fare" , "Provides what is required" , "Provides what is needed, say food and drink" , "provides what's needed" .)