Like a New Yorker's apple (3)

I believe the answer is:

big

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'like' is the definition.
Both the answer and definition are adjectives. Perhaps you can see a link between them that I can't see?

I don't understand the remainder of the clue.

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(Other definitions for big that I've seen before include "London bell" , "oversized" , "Large; generous" , "Circus tent" , "Massive" .)

I've seen this clue in the Evening Standard.

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