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Tear off, having haggard exterior that's relative (5-4)

Ross

I believe the answer is:

great-aunt

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'that's relative' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Another definition for great-aunt that I've seen is " Tag nature (anag) - relative".)

I've seen this clue in The Daily Express.
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