Iron output (5)

I believe the answer is:

steam

'iron output' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for steam that I've seen before include "Form of water" , "get very angry" , "Travel in liner" , "Water vapour; impetus" , "Momentum - boiled water" .)

I've seen this clue in the Penny Press, the Newsday, the LA Times, the King Feature Syndicate and The Wall Street Journal.

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