Hack from the wafer (3)
I believe the answer is:
hew
'hack' is the definition.
(I've seen this in another clue)
'from the wafer' is the wordplay.
'from' says the answer is hidden in the clue.
'HEW' can be found hidden inside 'the wafer'.
(Other definitions for hew that I've seen before include "Carve out of wood or stone" , "Chop or cut with axe" , "Chop; sounds like colour" , "Chop (wood)" , "Chop or hack at" .)