Crossword Genius

Unchanging exterior masking sign of affection (7)

Ross

I believe the answer is:

eternal

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'unchanging' is the definition.
(thesaurus)

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(Other definitions for eternal that I've seen before include "Never-ending, existing always" , "Everlasting, not affected by time" , "One being forever" , "Lasting forever, tediously persistent" , "like Rome?" .)

I've seen this clue in The Independent.
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