It's unique without second fireplace (5)

I believe the answer is:

ingle

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'fireplace' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for ingle that I've seen before include "warm part of house" , "Kind of fireplace - get leg in" , "An old-fashioned fireplace, maybe with nook" , "Fire - fireplace" , "Fireplace (mainly dialect)" .)

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

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