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Component in a combustion engine (5,4)

Ross

I think it could be either:

Which length description are you looking for?:

9

5,4

spark plug

(Other definitions for spark plug that I've seen before include "Electrical device fitted in the cylinder heads of an internal-combustion engine" , "Agent of ignition" , "Ignition device in an internal-combustion engine" , "engine component" , "Does it help to start driving" .)

I've seen this clue in The Times.
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