Tsarina wrongfully executed crafty fellow (7)
I believe the answer is:
artisan
'crafty fellow' is the definition.
(someone skilled in a particular craft)
'tsarina wrongfully executed' is the wordplay.
'wrongfully executed' indicates anagramming the letters (the letters presented or executed wrongly).
'tsarina' anagrammed gives 'ARTISAN'.
(Other definitions for artisan that I've seen before include "one in command of craft?" , "Skilled craftsperson" , "Skilled worker at craft or trade" , "Technician" , "Tsarina (anag.)" .)