Reject with contempt (5)
I believe the answer is:
spurn
'reject with contempt' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for spurn that I've seen before include "Treat with contempt" , "Reject with contempt" , "Repudiate" , "Reject scornfully, say unwanted suitor" , "Contemptuously dismiss" .)