Convince (6)
'convince' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for persuade that I've seen before include "Urge successfully" , "Talk round" , "'Coax, inveigle (8)'" , "Induce or convince to do something" , "Cause (someone) to believe" .)
'convince' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for assure that I've seen before include "Impart confidence" , "Say positively" , "Cover with a policy" , "State positively and confidently, guarantee" , "Tell positively" .)
'convince' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sway that I've seen before include "Move gently" , "Oscillate" , "Ways to waver in opinion or posture" , "Rock to and fro" , "Totter; influence" .)