Tsarina sacked skilled worker (7)
I believe the answer is:
artisan
'skilled worker' is the definition.
(an artisan is a skilled craftsperson)
'tsarina sacked' is the wordplay.
'sacked' is an anagram indicator.
'tsarina' anagrammed gives 'ARTISAN'.
(Other definitions for artisan that I've seen before include "Skilled manual 17" , "Skilled worker at craft or trade" , "Crafty sort" , "one in command of craft?" , "man with skill" .)