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Run out of fight, suffering with fever (4)

Ross

I believe the answer is:

ague

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'fever' is the definition.
(illness causing fever)

I don't understand the rest of the clue.

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(Other definitions for ague that I've seen before include "met with cheek in Twelfth Night" , "Illness with fever and shivering, malaria say" , "Feverish chill" , "attack" , "Complaint" .)

I've seen this clue in The Irish Times.
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