Crossword Genius

Staying power of stonefish? (5)

Ross

I believe the answer is:

steel

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

'staying power' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for steel that I've seen before include "Structural metal alloy" , "Hard, strong, grey alloy" , "nerve" , "The staying power" , "Mixture of carbon and iron" .)

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