Body part covered by prisoner's sunglasses? (4-3)

I believe the answer is:

clip-ons

'sunglasses?' is the definition.
(I've seen this before)

'body part covered by prisoner's' is the wordplay.
'body part' becomes 'lip' (lip is a kind of body part).
'covered by' indicates putting letters inside.
'prisoner's' becomes 'con's' (abbreviation for 'convict').
'lip' put into 'cons' is 'CLIP-ONS'.

I've seen this clue in The Independent.

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