Fighter disposing of both sides creates classic record (7)

I believe the answer is:

soldier

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'fighter' is the definition.
(soldiers fight in wars)

I cannot understand how the remainder of the clue works.

(Other definitions for soldier that I've seen before include "Enlisted man or woman" , "Member of army" , "Strip of toast to go with a boiled egg" , "trained killer" , "Server in army" .)

I've seen this clue in The Guardian.

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