Some sugar used for punishment? (4)
I believe the answer is:
cane
This clue is a double definition.
'some sugar' is the first definition.
(cane sugar is a kind of sugar)
'for punishment?' is the second definition.
(I've seen this in other clues)
'used' acts as a link.
(Other definitions for cane that I've seen before include "African country formerly called Gold Coast" , "A stick to lean on" , "Beat - bamboo - stick" , "Strong stem for to allow a plant to climb" , "Eg, rattan" .)