Country backing force during tricky gun fighting method (4,2)
I believe the answer is:
kung fu
'fighting method' is the definition.
'kung fu' can be an answer for 'fighting' (I've seen this before). I'm unsure of the 'method' bit.
'country backing force during tricky gun' is the wordplay.
'country backing' becomes 'ku' (I am not sure about this - if you are sure you should believe this answer much more).
'force' becomes 'f' (symbol used in Physics e.g. f=ma).
'during' is an insertion indicator.
'tricky' indicates an anagram.
'gun' anagrammed gives 'ngu'.
'f' put into 'ngu' is 'ngfu'.
'ku'+'ngfu'='KUNG FU'
Can you help me to learn more?
(Other definitions for kung fu that I've seen before include "Unarmed Chinese martial art" , "fighting" , "'A Chinese martial art (4,2)'" , "Chinese type of karate" , "Chinese form of unarmed combat, was a TV serial" .)