Calf in a state? (3,6)

I believe the answer is:

new jersey

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'a state?' is the definition.
(New Jersey is an example)

I can't explain the rest of the clue.

(Other definitions for new jersey that I've seen before include "Wardrobe extension" , "calf?" , "change of clothing" , "Unused pullover" , "Newark's state" .)

I've seen this clue in The Times.

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