Drive outrigger regularly (4)
I believe the answer is:
urge
'drive' is the definition.
(thesaurus)
'outrigger regularly' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
The alternating letters of 'outrigger' are 'URGE'.
(Other definitions for urge that I've seen before include "Press; drive" , "Compulsion; egg on" , "Strongly recommend; impulse" , "Encourage (to do something)" , "Encourage, press" .)