Refuse incentive at start of November (5)
I believe the answer is:
spurn
'refuse' is the definition.
(spurning is a kind of refusing)
'incentive at start of november' is the wordplay.
'incentive' becomes 'spur' (spur can mean an incentive or stimulus).
'at start of' says to take the initial 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" .)