Crossword Genius

Part of a petrol engine (4)

Ross

I believe the answer is:

role

'part' is the definition.
(eg a theatrical role)

'of a petrol engine' is the wordplay.
'of' indicates a hidden word.
'ROLE' is hidden in the letters of 'petrol engine'.

(Other definitions for role that I've seen before include "Part in play, film etc" , "Impersonation" , "Actor's part" , "Stage part" , "Part played (in life?)" .)

I've seen this clue in the Evening Standard.
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