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 am not sure about this - if you are sure you should believe this answer much more).
'coming round' is an insertion indicator.
'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" .)