Curious opposites are back-to-back (5)

I believe the answer is:

nosey

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'curious' is the definition.
(similar in meaning)

I can't explain the remainder of the clue.

(Other definitions for nosey that I've seen before include "Curious in nasal way" , "Impertinent" , "Prying" , "Showing too much interest in other people's affairs" , "Offensively curious or inquisitive" .)

I've seen this clue in The Sun.

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