Cheese makes trio act differently (7)
I believe the answer is:
ricotta
'cheese' is the definition.
(ricotta is a type of cheese)
'trio act differently' is the wordplay.
'differently' indicates an anagram.
'trio'+'act'='trioact'
'trioact' is an anagram of 'RICOTTA'.
'makes' is the link.
(Other definitions for ricotta that I've seen before include "dairy produce" , "Read the riot act about the cheese" , "Ital. cheese" , "Cheese - Riot Act (anag)" , "cheese, Italian style" .)