Crossword Genius

Motor on, in gear: tyre needs changing (6,6)

Ross

I believe the answer is:

rotary engine

'motor' is the definition.
(rotary engine is a kind of motor)

'on in gear tyre needs changing' is the wordplay.
'needs changing' indicates anagramming the letters (I've seen this in other clues).
'on'+'in'+'gear'+'tyre'='oningeartyre'
'oningeartyre' is an anagram of 'ROTARY ENGINE'.

I've seen this clue in The Times.
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