Cook made to take back unusual type of sugar (8)
I believe the answer is:
demerara
'type of sugar' is the definition.
(I've seen this before)
'cook made to take back unusual' is the wordplay.
'cook' is an anagram indicator.
'to take' is an insertion indicator.
'back' shows that the letters should be reversed in order.
'unusual' becomes 'rare' (I've seen this before).
'rare' backwards is 'erar'.
'made' is an anagram of 'dema'.
'dema' enclosing 'erar' is 'DEMERARA'.
(Other definitions for demerara that I've seen before include "That's sweet!" , "Sweet thing" , "South American river - sugar" , "Type of brown sugar" , "Light brown cane sugar" .)