Name for an extract of buttermilk (4)
I believe the answer is:
term
'name' is the definition.
(I know this)
'an extract of buttermilk' is the wordplay.
'an extract of' indicates a hidden word (I've seen this in other clues).
'TERM' is hidden in the letters of 'buttermilk'.
'for' acts as a link.
(Other definitions for term that I've seen before include "Limit - school time" , "Time spent at school" , "Expression, or period in which law court holds sessions" , "Scholastic period" , "Time in jail" .)