Incentive, with no love lost, to treat disdainfully (5)
I believe the answer is:
spurn
'to treat disdainfully' is the definition.
I can't judge whether this definition defines the answer.
'incentive with no love lost' is the wordplay.
'incentive' becomes 'spur' (an incentive spur).
'with' says to put letters next to each other.
'love' becomes 'o' (love means zero in tennis).
'lost' suggests deleting specific letters.
'no' with 'o' taken out is 'n'.
'spur'+'n'='SPURN'
Can you help me to learn more?
(Other definitions for spurn that I've seen before include "Slight" , "Contemptuously reject" , "Despise" , "Reject advances scornfully" , "Treat with contempt" .)