Apricot tart filled with cheese (7)
I believe the answer is:
ricotta
'cheese' is the definition.
(ricotta is a kind of cheese)
'apricot tart filled with' is the wordplay.
'with' indicates a hidden word.
'RICOTTA' is hidden in the letters of 'apricot tart filled'.
(Other definitions for ricotta that I've seen before include "Cheese - Riot Act (anag)" , "cheese found" , "One soft cheese" , "may come from Italian press?" , "dairy produce" .)