Crossword Genius

Clear to race having changed throttle (11)

Ross

I believe the answer is:

accelerator

'throttle' is the definition.
(synonyms)

'clear to race having changed' is the wordplay.
'having changed' is an anagram indicator.
'clear'+'to'+'race'='cleartorace'
'cleartorace' anagrammed gives 'ACCELERATOR'.

(Other definitions for accelerator that I've seen before include "Driver's foot pedal" , "Pedal controlling vehicle's speed" , "It increases road speed" , "Substance speeding up a chemical process" , "Throttle" .)

I've seen this clue in The Times.
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