Sugar taken from a closet? (7)
I believe the answer is:
lactose
'sugar' is the definition.
(lactose is a kind of sugar)
'from a closet?' is the wordplay.
'from' is an anagram indicator (from the letters).
'a'+'closet'='acloset'
'acloset' with letters rearranged gives 'LACTOSE'.
'taken' acts as a link.
(Other definitions for lactose that I've seen before include "A sugar present in milk" , "milky sweetener" , "Part of milk" , "White substance in milk" , "Sugar found in milk" .)