What nun and faun have in common? Not getting close! (8)

I believe the answer is:

unending

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'not getting close' is the definition.
(having no ending or close)

I don't understand the rest of the clue.

(Other definitions for unending that I've seen before include "Everlasting" , "Perpetual - continual" , "Eternal" , "Continuing indefinitely" , "This is not getting close" .)

I've seen this clue in The Times.

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