Crossword Genius

Flatten metal (4)

Ross

I believe the answer is:

iron

I believe this clue is a double definition.

'flatten' is the first definition.
(I know this)

'metal' is the second definition.
(iron is a metal)

(Other definitions for iron that I've seen before include "Implacable - golf club" , "Strong metal; golf club" , "sort of club" , "Heavy metal that rusts easily" , "Main part of steel" .)

I've seen this clue in The Times and The Telegraph.
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