Fight club? That's been discarded (5,4)

I believe the answer is:

scrap iron

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'been discarded' is the definition.
I can't judge whether this definition defines the answer.

'fight club?' is the wordplay.
'fight' becomes 'scrap' (a scrap is a minor fight).
'club?' becomes 'iron' (type of golf club).
'scrap'+'iron'='SCRAP-IRON'

'that's' acts as a link.

Can you help me to learn more?

(Other definitions for scrap iron that I've seen before include "for recycling" , "Waste metal for melting down" , "Discarded metal" , "rubbish" .)

I've seen this clue in The Daily Express.

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