Crossword Genius

Advantage of both ends of Boy Charlton (4)

Ross

I believe the answer is:

boon

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

'advantage' is the definition.
(both can mean a benefit or asset)

'of both ends of boy charlton' is the wordplay.
I cannot quite see how this works, but
'of' could be 'o' and 'o' is found in the answer.
'boy' could be 'bo' and 'bo' is located in the answer.
A single letter 'n' remains which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for boon that I've seen before include "Gracious gift" , "Godsend" , "Benefaction" , "Something beneficial - a blessing" , "Benefit and advantage" .)

I've seen this clue in the Sydney Morning Herald.
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