Train as mobile mechanic, perhaps (7)
I believe the answer is:
artisan
'mechanic perhaps' is the definition.
(mechanic is a kind of artisan)
'train as mobile' is the wordplay.
'mobile' indicates anagramming the letters.
'train'+'as'='trainas'
'trainas' is an anagram of 'ARTISAN'.
(Other definitions for artisan that I've seen before include "Tsarina (anag.)" , "Journeyman" , "Train as (anag) - craftsman" , "Mechanic" , "Sinatra (anag) -- skilled manual worker" .)