Set ideas about part of New York (4,4)

I believe the answer is:

east side

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

'part of new york' is the definition.
'east side' can be an answer for 'part' (east side is a kind of part). I am not certain of the 'of new york' bit.

'set ideas about' is the wordplay.
'about' indicates an anagram.
'set'+'ideas'='setideas'
'setideas' anagrammed gives 'EAST SIDE'.

Can you help me to learn more?

I've seen this clue in The Globe and Mail.

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