Girl turning over in bed (3)

I believe the answer is:

deb

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'girl' is the definition.

'turning over in bed' is the wordplay.
'bed' anagrams to 'DEB'.
However, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for deb that I've seen before include "In brief, a society girl getting out of bed" , "Young woman coming out in society, in short" , "Young socialite" , "Young woman making her first appearance in society, in short" , "Girl just entering society" .)

I've seen this clue in the Evening Standard.

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