Presumably, when Old King Cole called for his pipe and called for his bowl? I heard that one in a room full of barmen! (5,5)
I believe the answer is:
court order
'presumably when old king cole called for his pipe and called for his bowl? i heard that one' is the definition.
I don't know anything about this answer so I cannot tell whether this works.
'a room full of barmen' is the wordplay.
'a room' becomes 'court' (court is a kind of room).
'full of barmen' becomes 'order' (I can't explain this - if you can you should give a lot more credence to this answer).
'court'+'order'='COURT ORDER'
'in' is the link.
Can you help me to learn more?
(Other definitions for court order that I've seen before include "Judicial writ" , "Instruction" , "Judge's direction" , "direction of Old Bailey?" .)