Show contempt for a skewer (4)
I believe the answer is:
spit
I believe this clue is a double definition.
'show contempt' is the first definition.
(I've seen this before)
'for a skewer' is the second definition.
(spit is a kind of skewer)
(Other definitions for spit that I've seen before include "on the barbecue?" , "Show contempt" , "cook a roast?" , "Large skewer - expel saliva" , "Rotating cooker" .)