Persuade or incite (4)
I believe the answer is:
urge
I believe this is a double definition.
'persuade' is the first definition.
(I've seen this in another clue)
'incite' is the second definition.
(I've seen this in another clue)
(Other definitions for urge that I've seen before include "Encourage or entreat earnestly" , "Strong desire; impel" , "Impel - impulse" , "Encourage (to do something)" , "Persuade - proclivity" .)