Strong alloy (5)

I think it could be either:

Which length description are you looking for?:

4,4

steel

'strong alloy' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for steel that I've seen before include "Strength, determination" , "nerve" , "May be cold" , "Structural metal alloy" , "Make hard and unfeeling" .)

I've seen this clue in The Wall Street Journal.

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