Crossword Genius

Fight the press using waste metal (5-4)

Ross

I believe the answer is:

scrap-iron

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

'waste metal' is the definition.
'scrap iron' can be an answer for 'metal' (scrap iron is a kind of metal). I am unsure of the 'waste' bit.

'fight the press' is the wordplay.
'fight' becomes 'scrap' (a scrap is a minor fight).
'the press' becomes 'iron' (I've seen this before).
'scrap'+'iron'='SCRAP-IRON'

'using' is the link.

Can you help me to learn more?

(Another definition for scrap-iron that I've seen is " Waste metal for melting down".)

I've seen this clue in the Sydney Morning Herald.
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