Possibly train as a skilled worker (7)
I believe the answer is:
artisan
'a skilled worker' is the definition.
(an artisan is a skilled craftsperson)
'possibly train as' is the wordplay.
'possibly' indicates an anagram.
'train'+'as'='trainas'
'trainas' is an anagram of 'ARTISAN'.
(Other definitions for artisan that I've seen before include "Skilled craftsperson" , "Skilled tradesman" , "Tsarina (anag.)" , "man with skill" , "crafty person?" .)