Maybe Gwen did make a dress for it (7)
I believe the answer is:
wedding
'a dress for it' is the definition.
I can't tell whether this defines the answer.
'maybe gwen did' is the wordplay.
'maybe' is an anagram indicator.
'gwen'+'did'='gwendid'
'gwendid' is an anagram of 'WEDDING'.
'make' acts as a link.
Can you help me to learn more?
(Other definitions for wedding that I've seen before include "Nuptials" , "Marriage ceremony" , "following 28 [SILVER]" , "Audience for the 13 14" , "Celebration of marriage" .)