Revolutionary three points for a dairy product (6)
I believe the answer is:
cheese
'for a dairy product' is the definition.
(cheese is a kind of dairy product)
'revolutionary three points' is the wordplay.
'three points' can mean three replacements for 'point'.
'revolutionary' becomes 'che' (Che Guevara the Marxist revolutionary).
'point' becomes 'e' (compass point).
'point' becomes 's'.
'point' becomes 'e' (compass point).
'che'+'e'+'s'+'e'='CHEESE'
(Other definitions for cheese that I've seen before include "Eg, Limburger" , "Dairy product - disc used in skittles" , "E.g. brie" , "Red Leicester" , "Food from the pressed curd of milk" .)