Fighting female concealing a warm heart (6)
I believe the answer is:
karate
'fighting' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'female concealing a warm heart' is the wordplay.
'female' becomes 'kate' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'concealing' is an insertion indicator.
'heart' indicates the central letters.
The central letters of 'warm' are 'ar'.
'kate' going around 'ar' is 'KARATE'.
Can you help me to learn more?
(Other definitions for karate that I've seen before include "Oriental-style chops" , "Martial art (with chopping?)" , "Unarmed-combat system" , "A taker (anag)" , "SPORT/GAME" .)