Persuade with flattery (6)
I believe the answer is:
cajole
'persuade with flattery' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for cajole that I've seen before include "'Coax, inveigle (6)'" , "Coaxingly persuade" , "'Coax, sweet-talk (6)'" , "Gently influence" , "Persuade using flattery" .)