Expert training learner to drive forward (6)
I believe the answer is:
propel
'drive forward' is the definition.
(I've seen this before)
'expert training learner' is the wordplay.
'expert' becomes 'pro' (I've seen this before).
'training' becomes 'pe'.
'learner' becomes 'l'.
'pro'+'pe'+'l'='PROPEL'
'to' acts as a link.
(Other definitions for propel that I've seen before include "Cause to move forward with force" , "Drive forwards" , "Push forwards" , "Launch" , "Drive or push forward as with oars" .)