Number wearing jewellery chattering (10)

I believe the answer is:

blethering

'chattering' is the definition.
(blethering is a kind of chattering)

'number wearing jewellery' is the wordplay.
'number' becomes 'ether' (anaesthetic, something which numbs).
'wearing' is an insertion indicator.
'jewellery' becomes 'bling' (informal term for jewellery).
'ether' inserted within 'bling' is 'BLETHERING'.

(Another definition for blethering that I've seen is " Going on about".)

I've seen this clue in The Times.

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