Peculiar child, but very much a favourite! (6)

I believe the answer is:

oddson

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'very much a favourite' is the definition.
I know nothing about this answer so I can't judge whether this works.

'peculiar child' is the wordplay.
'peculiar' becomes 'odd' (I've seen this in another clue).
'child' becomes 'son' (male child).
'odd'+'son'='ODDSON'

'but' is the link.

Can you help me to learn more?

I've seen this clue in The Irish News.

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