Horseplay when coming round to bed (5)
I believe the answer is:
futon
'bed' is the definition.
(type of bed)
'horseplay when coming round to' is the wordplay.
'horseplay when' becomes 'fun' (I can't explain this - if you can you should give a lot more credence to this answer).
'coming round' indicates putting letters inside.
'fun' going around 'to' is 'FUTON'.
Can you help me to learn more?
(Other definitions for futon that I've seen before include "Japanese quilt used as a bed" , "Japanese mattress with wooden frame used as bed" , "Japanese floor-mattress" , "Sleep on it" , "Resting place" .)