Force couple into bunk for hours at any time (9)
I believe the answer is:
shiftwork
'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".)