It's made two composers get drunk in the East End (7,5)
I believe the answer is:
rhyming slang
'east end' is the definition.
Both the definition and answer are singular nouns.
Perhaps they are linked in a way I don't understand?
'it's made two composers get drunk in' is the wordplay.
I cannot quite see how this works, but
'in' is present in the answer.
This explanation may well be incorrect...
'the' acts as a link.
Can you help me to learn more?
(Other definitions for rhyming slang that I've seen before include "Cockney jargon" , "Cockney poetical chatter" , "Cockney lingo" , "Daisy roots, china plate and dicky bird, for example" , "Cockney "plates", suggesting "meat", for instance" .)