Crossword Genius

Place for putting warning system in car for learner? (9)

Ross

I believe the answer is:

greenhorn

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'for learner?' is the definition.
(thesaurus)

'place for putting warning' is the wordplay.
'place for putting' becomes 'green' (I've seen this in another clue).
'warning' becomes 'horn' (a horn might be used as a warning).
'green'+'horn'='GREENHORN'

'system in car' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for greenhorn that I've seen before include "Person with no experience" , "One's not experienced" , "Rookie (American)" , "colt" , "Tenderfoot" .)

I've seen this clue in The Telegraph.
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