Crossword Genius

Firm German wheel (3)

Ross

I believe the answer is:

cog

'wheel' is the definition.
(wheel with teeth in a machine)

'firm german' is the wordplay.
'firm' becomes 'co' (a firm is a company).
'german' becomes 'g' (abbreviation).
'co'+'g'='COG'

(Other definitions for cog that I've seen before include "minor employee" , "Machine component" , "Small gear-wheel" , "One has teeth" , "Each of series of teeth on wheel" .)

I've seen this clue in The Mirror.
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