One turning in abandoned terrier (7)

I believe the answer is:

retirer

'one turning in' is the definition.
(retire can mean to turn in or go to bed)

'abandoned terrier' is the wordplay.
'abandoned' indicates anagramming the letters.
'terrier' anagrammed gives 'RETIRER'.

(Other definitions for retirer that I've seen before include "he goes to bed" , "One going to bed" .)

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