A bit quiet; embarrassed (5)

I believe the answer is:

shred

'a bit' is the definition.
(I've seen this before)

'quiet embarrassed' is the wordplay.
'quiet' becomes 'sh'.
'embarrassed' becomes 'red' (I've seen this before).
'sh'+'red'='SHRED'

(Other definitions for shred that I've seen before include "Small piece torn from something" , "Bit of cloth" , "Small part" , "Tiny amount" , "Small, thin scrap" .)

I've seen this clue in the Evening Standard.

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