Fierce leader wins in local district (4)
I believe the answer is:
wild
'fierce' is the definition.
(similar in meaning)
'leader wins in local district' is the wordplay.
'leader' says to take the initial letters.
The first letters of 'wins in local district' is 'WILD'.
(Other definitions for wild that I've seen before include "Savage" , "unruly" , "Impulsive" , "Born Free?" , "Feral - crazy" .)