Source of power (5)

I think it could be either:

Which length description are you looking for?:

7,6

steam

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

This is the entire clue.

(Other definitions for steam that I've seen before include "Kettle emission" , "Driving force" , "Vapour from water at boiling point" , "Vaporous exhalation" , "Vapour; energy" .)

I've seen this clue in The Mirror, The Guardian, The Times, the Newsday.com, The Telegraph, the Wall Street Journal and The Washington Post.

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