Crossword Genius

One who assists a chap at the wheel in Monaco? (7)

Ross

I believe the answer is:

abetter

I'm a little stuck... Click here to teach me more about this clue!

'one who assists a' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'chap at the wheel in monaco?' is the wordplay.
I cannot really understand how this works, but
'chap' could be 'abe' and 'abe' is located in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found in the answer.
The remaining letters 'ter' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for abetter that I've seen before include "Partner in crime; tree bat (anag.)" , "who gives encouragement?" , "He helps criminal" , "One who encourages" , "one who helps in a crime" .)

I've seen this clue in The Independent.
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