Working as train mechanic, perhaps (7)
I believe the answer is:
artisan
'mechanic perhaps' is the definition.
(mechanic is a kind of artisan)
'working as train' is the wordplay.
'working' is an anagram indicator.
'as'+'train'='astrain'
'astrain' is an anagram of 'ARTISAN'.
(Other definitions for artisan that I've seen before include "Skilled tradesman" , "Mechanic" , "Sinatra (anag) -- skilled manual worker" , "Technician" , "Skilled manual 17" .)