Possibly train as mechanic (7)
I believe the answer is:
artisan
'mechanic' is the definition.
(I've seen this before)
'possibly train as' is the wordplay.
'possibly' indicates anagramming the letters.
'train'+'as'='trainas'
'trainas' with letters rearranged gives 'ARTISAN'.
(Other definitions for artisan that I've seen before include "Train as (anag) - craftsman" , "Skilled worker or craftsman" , "Skilled worker by hand" , "Mechanic" , "man with skill" .)