Attire for teen, one on beat boxes (10)

I believe the answer is:

bobbysocks

'attire for teen' is the definition.
(socks historically worn by teenage girls)

'one on beat boxes' is the wordplay.
'one on beat' becomes 'bobby' (as in a police officer working on a beat).
'boxes' becomes 'socks' (sock can mean to punch or box).
'bobby'+'socks'='BOBBYSOCKS'

I've seen this clue in The Times.

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