Crossword Genius

It's made two composers get drunk in the East End (7,5)

Ross

I believe the answer is:

rhyming slang

I'm a little stuck... Click here to teach me more about this clue!

'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" .)

I've seen this clue in The Guardian.
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