It is not found in ice sheets or dairy products? (7)
I believe the answer is:
cheeses
'dairy products?' is the definition.
(cheese is a kind of dairy product)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for cheeses that I've seen before include "Dairy products, can be hard or soft" , "'Gruyere, Brie etc. (7)'" , "Camembert, chedder etc." , "Foods prepared from the pressed curd of milk" , "Stilton and cheddar, perhaps" .)