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Puzzling child, as favourite may be (4-2)

Ross

I believe the answer is:

odds-on

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

'puzzling child as favourite may be' is the definition.
I can't tell whether this definition defines the answer.

'puzzling child' is the wordplay.
'puzzling' becomes 'odd' (I've seen this in another clue).
'child' becomes 'son' (male child).
'odd'+'son'='ODDS-ON'

Can you help me to learn more?

(Other definitions for odds-on that I've seen before include "Bookie's assessment of success being more likely than failure" , "With success more likely as bookie would calculate" , "With success more likely than failure - check with bookie" , "With success more likely than favour - ask bookie" , "Rated likely to win" .)

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