Skeletal part of limb on young boy (4)

I believe the answer is:

bony

'skeletal' is the definition.
(synonyms)

'part of limb on young boy' is the wordplay.
'part of' indicates the answer is hidden within the clue.
'BONY' can be found hidden inside 'limb on young boy'.

(Other definitions for bony that I've seen before include "Angular" , "Skeletal" , "Osseous" , "Scrawny" , "[GAUNT] ?" .)

I've seen this clue in The Irish Independent.

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