Crossword Genius

Small crew for engine driver (5)

Ross

I believe the answer is:

steam

'for engine driver' is the definition.
(a steam engine is powered by steam)

'small crew' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'crew' becomes 'team' (both can mean a group of colleagues).
's'+'team'='STEAM'

(Other definitions for steam that I've seen before include "enthusiasm" , "A lot of hot air" , "Sort of water" , "Mates (anag)" , "Water at boiling temperature diffused in the atmosphere" .)

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