Drive Golf into river (4)
I believe the answer is:
urge
'drive' is the definition.
(I've seen this before)
'golf into river' is the wordplay.
'golf' becomes 'g' (phonetic alphabet: alpha, bravo, charlie etc.).
'into' is an insertion indicator.
'river' becomes 'ure' (River Ure).
'g' going inside 'ure' is 'URGE'.
(Other definitions for urge that I've seen before include "Longing" , "Advise strongly or prod" , "Compulsion; egg on" , "Encourage, press" , "Strong desire; impel" .)