Crossword Genius

Force couple into bunk for hours at any time (9)

Ross

I believe the answer is:

shiftwork

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'force couple into bunk' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'hours at any time' is the wordplay.
'hours' becomes 'shift' (shift is a kind of hours).
'at any time' becomes 'work' (I can't explain this - if you can you should believe this answer much more).
'shift'+'work'='SHIFTWORK'

'for' is the link.

Can you help me to learn more?

(Another definition for shiftwork that I've seen is " If on this, it means toiling at different periods".)

I've seen this clue in The Independent.
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