Sleep back-to-back as before with no trouble (4)

I believe the answer is:

doss

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'sleep' is the definition.
(to doss is to sleep in an improvised bed)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for doss that I've seen before include "Sleep in a makeshift bed" , "In slang, sleep on sods" , "Sleep in rough or improvised accommodation" , "go to bed" , "going off to sleep" .)

I've seen this clue in The Sunday Times and The Times.

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