Strongly recommend (4)
I believe the answer is:
urge
'strongly recommend' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for urge that I've seen before include "Encourage, press" , "Induce; yearning" , "Compulsion; egg on" , "Advise strongly or prod" , "Impel, exhort" .)