There's plenty of iron in it (5)

I believe the answer is:

steel

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'it' is the definition.
The definition suggests a singular noun which matches the answer.

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(Other definitions for steel that I've seen before include "Strong metal" , "Structural metal alloy" , "Determination, metal" , "Make hard and unfeeling" , "Hard, strong, grey alloy" .)

I've seen this clue in the Evening Standard.

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