Slice of apricot tart and cheese (7)
I believe the answer is:
ricotta
'cheese' is the definition.
(ricotta is a kind of cheese)
'slice of apricot tart and' is the wordplay.
'slice of' says the answer is hidden in the clue.
'RICOTTA' can be found hidden inside 'apricot tart and'.
(Other definitions for ricotta that I've seen before include "may come from Italian press?" , "Italian curd cheese" , "cheese, Italian style" , "Sheep's milk cheese" , "Cheese - Riot Act (anag)" .)