Crossword Genius

Way fish harden (5)

Ross

I believe the answer is:

steel

'harden' is the definition.
(thesaurus)

'way fish' is the wordplay.
'way' becomes 'st' (abbreviation for street).
'fish' becomes 'eel' (eel is a kind of fish).
'st'+'eel'='STEEL'

(Other definitions for steel that I've seen before include "Iron/carbon alloy" , "Determination, metal" , "Hard iron alloy" , "brace" , "Mixture of carbon and iron" .)

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