Give a little push (4)
I believe the answer is:
urge
'give a little push' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for urge that I've seen before include "Advise earnestly, spur" , "Capital of Colombia" , "Appeal to" , "Encourage, press" , "Encourage or entreat earnestly" .)