Tucked into Cagliari cottage cheese (7)
I believe the answer is:
ricotta
'cheese' is the definition.
(ricotta is a type of cheese)
'tucked into cagliari cottage' is the wordplay.
'tucked into' says the answer is hidden in the clue.
'RICOTTA' is hidden in the letters of 'cagliari cottage'.
(Other definitions for ricotta that I've seen before include "Read the riot act about the cheese" , "may come from Italian press?" , "Sheep's milk cheese" , "Italian curd cheese" , "Italian 4 across" .)