King leads a charge to create defensive system (6)
I believe the answer is:
karate
'defensive system' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'king leads a charge' is the wordplay.
'leads' suggests taking the first letters.
'charge' becomes 'rate' (rate is a kind of charge).
The initial letter of 'king' is 'k'.
'k'+'a'+'rate'='KARATE'
'to create' acts as a link.
Can you help me to learn more?
(Other definitions for karate that I've seen before include "A Jap. martial art" , "Japanese martial art" , "fighting system" , "Unarmed-combat system" , "Oriental-style chops" .)