Italian dairy product with slice of apricot tart (7)
I believe the answer is:
ricotta
'italian dairy product' is the definition.
(type of Italian cheese)
'slice of apricot tart' is the wordplay.
'slice of' indicates the answer is hidden within the clue.
'RICOTTA' is hidden in the letters of 'apricot tart'.
'with' acts as a link.
(Other definitions for ricotta that I've seen before include "Italian 8 across" , "Italian 4 across" , "Soft white cheese used in Italian cooking" , "cheese, Italian style" , "Cheese - Riot Act (anag)" .)