Trendy party with good food (3,3)
I believe the answer is:
hot dog
'food' is the definition.
(hot dog is a food product)
'trendy party with good' is the wordplay.
'trendy' becomes 'hot' (hot can mean trendy or fashionable).
'party' becomes 'do' (do is a kind of party).
'with' means one lot of letters go next to another.
'good' becomes 'g' (abbreviation).
'hot'+'do'+'g'='HOT DOG'
(Other definitions for hot dog that I've seen before include "Sausage in a roll - acrobatic skier" , "Meat in roll" , "Sausage snack" , "Sausage in bread-roll for thermal canine" , "grub?" .)