Drive on in amorous pursuit (4)
I believe the answer is:
spur
'drive on' is the definition.
(I've seen this before)
'in amorous pursuit' is the wordplay.
'in' indicates the answer is hidden within the clue.
'SPUR' is hidden within 'amorous pursuit'.
(Other definitions for spur that I've seen before include "outcrop" , "Goad; stimulus" , "Goad as for a horse" , "Cowboy's goading instrument" , "side road" .)