Crossword Genius

Mates using old power (5)

Ross

I believe the answer is:

steam

'old power' is the definition.

'mates using' is the wordplay.
'using' indicates an anagram (the letters used in a different way).
'mates' with letters rearranged gives 'STEAM'.

(Other definitions for steam that I've seen before include "Energy (colloq.)" , "Vaporised water" , "Invisible gas from boiling water" , "Mates (anag)" , "Pre-digital" .)

I've seen this clue in The Mirror.
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