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Fair on managing boxing event that's gruelling

Ross

I believe the answer is:

iron man

I'm a little stuck... Click here to teach me more about this clue!

'event that's gruelling' is the definition.
I can't judge whether this defines the answer.

'fair on managing boxing' is the wordplay.
'boxing' indicates a hidden word (the solution is contained or boxed up by the clue).
'IRON-MAN' is hidden within 'fair on managing'.

Can you help me to learn more?

(Other definitions for iron man that I've seen before include "one of great strength" , "Endurance competition" , "endurance event" , "Tough event" , "fellow of great strength" .)

I've seen this clue in The Telegraph.
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