Coy going to bed (8)

I believe the answer is:

retiring

I believe this clue is a double definition.

'coy' is the first definition.
(thesaurus)

'going to bed' is the second definition.
('retire' can be a synonym of 'go to bed')

(Other definitions for retiring that I've seen before include "of unobtrusive aspect" , "Reserved" , "Giving up work for good" , "Shunning contact with others" , "Like an unassertive person" .)

I've seen this clue in The Telegraph.

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