Food is complementary inside the dance club (5)
I believe the answer is:
disco
'the dance club' is the definition.
(I've seen this before)
'food is complementary inside' is the wordplay.
'inside' indicates a hidden word.
'DISCO' can be found hidden inside 'food is complementary'.
(Other definitions for disco that I've seen before include "Musical entertainment" , "Style of pop music" , "Musical party" , "lively entertainment, for some?" , "Dancing to records" .)