Deformed bird egg in part of garden (9)

I believe the answer is:

bowlegged

'deformed' is the definition.
(thesaurus)

'bird egg in part of garden' is the wordplay.
'bird' becomes 'owl' (owl is a kind of bird).
'in' means one lot of letters goes inside another.
'part of garden' becomes 'bed' (flower bed).
'owl'+'egg'='owlegg'
'owlegg' placed into 'bed' is 'BOWLEGGED'.

(Another definition for bowlegged that I've seen is " Having bandy lower limbs".)

I've seen this clue in The Sunday Times and The Times.

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