Not losing cover in winter is enduringly popular (9)

I believe the answer is:

evergreen

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'enduringly popular' is the definition.
(evergreen can mean popular or dependable)

I can't explain the rest of the clue.

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(Other definitions for evergreen that I've seen before include "Laurel, for example" , "Pine, for example" , "kind of shrub" , "Hardy, no doubt" , "Star anise, say" .)

I've seen this clue in The Times.

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