Crossword Genius

Part of Manhattan is sedate surprisingly (8)

Ross

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8

4,4

eastside

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'part of manhattan' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?

'is sedate surprisingly' is the wordplay.
'surprisingly' indicates anagramming the letters (a surprising ordering of the letters).
'is'+'sedate'='issedate'
'issedate' is an anagram of 'EASTSIDE'.

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I've seen this clue in The Guardian.
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