Reasons for which people fight (6)

I believe the answer is:

causes

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'reasons' is the definition.
(the reasons for something)

I can't explain the rest of the clue.

(Other definitions for causes that I've seen before include "Brings" , "Reasons why things happen" , "'Reasons, grounds (6)'" , "Origins or crusaders" , "See 5" .)

I've seen this clue in The Globe and Mail.

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