Crossword Genius

Sad teen upset in London region (4,3)

Ross

I believe the answer is:

east end

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'london region' is the definition.
The definition suggests a singular noun which matches the answer.

'sad teen upset' is the wordplay.
'upset' is an anagram indicator.
'sad'+'teen'='sadteen'
'sadteen' with letters rearranged gives 'EAST END'.

'in' is the link.

Can you help me to learn more?

(Other definitions for east end that I've seen before include "Cockneyland" , "Bow" , "ockney London" , "Cockney's part of London" , "Part of London first to see rising sun" .)

I've seen this clue in The Sun.
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