Make the cocoa go round in jug? (4)
I believe the answer is:
stir
'jug?' is the definition.
(both are slang for prison)
'make the cocoa go round' is the wordplay.
I cannot really see how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found in the answer.
The remaining letters 'sir' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'in' acts as a link.
Can you help me to learn more?
(Other definitions for stir that I've seen before include "riot" , "Cause trouble" , "A slangy prison - whisk it" , "in which you'll find people with convictions" , "Agitate, arouse" .)