Like-minded party people eating battered fish (7)
I believe the answer is:
whiting
'fish' is the definition.
(whiting is a kind of fish)
'like-minded party people eating battered' is the wordplay.
'like-minded party people' becomes 'wing' (eg left wing or right wing).
'eating' means one lot of letters goes inside another.
'battered' becomes 'hit'.
'wing' placed around 'hit' is 'WHITING'.
(Other definitions for whiting that I've seen before include "Small sea fish or ground chalk for painting" , "Small fish related to cod" , "North Atlantic food fish" , "Edible marine fish" , "[SOMETHING FISHY]" .)