Possibly a strain for skilled worker (7)
I believe the answer is:
artisan
'skilled worker' is the definition.
(an artisan is a skilled craftsperson)
'possibly a strain' is the wordplay.
'possibly' indicates an anagram.
'a'+'strain'='astrain'
'astrain' anagrammed gives 'ARTISAN'.
'for' is the link.
(Other definitions for artisan that I've seen before include "Tsarina (anag.)" , "Egypt peninsula; holy Mount" , "Crafty sort" , "Smith" , "Train as (anag) - craftsman" .)