Trains a different craftsman (7)
I believe the answer is:
artisan
'craftsman' is the definition.
(synonyms)
'trains a different' is the wordplay.
'different' indicates anagramming the letters (letters placed in a different order).
'trains'+'a'='trainsa'
'trainsa' anagrammed gives 'ARTISAN'.
(Other definitions for artisan that I've seen before include "Skilled tradesman" , "Egypt peninsula; holy Mount" , "Sinatra (anag) -- skilled manual worker" , "Crafty sort" , "man with skill" .)