Refuse incentive at start of November (5)
I believe the answer is:
spurn
'refuse' is the definition.
(I know that spurn is a more specific form of refuse)
'incentive at start of november' is the wordplay.
'incentive' becomes 'spur' (spur can mean an incentive or stimulus).
'at start of' indicates taking the first letters.
The first letter of 'november' is 'n'.
'spur'+'n'='SPURN'
(Other definitions for spurn that I've seen before include "Humber lighthouse" , "Despise" , "Reject with contempt" , "Treat with contempt" , "Scorn" .)