Put on trainer in old vehicle (10)
I believe the answer is:
stagecoach
'old vehicle' is the definition.
(I've seen this before)
'put on trainer' is the wordplay.
'put on' becomes 'stage' (to put on a show is to present or stage it).
'trainer' becomes 'coach' (coach is a kind of trainer).
'stage'+'coach'='STAGECOACH'
'in' acts as a link.
(Other definitions for stagecoach that I've seen before include "One gets around stops" , "Diligence" , "Travelling" , "early form of transport" , "Great Western" .)