Crossword Genius

Elderly get enclosed, but not initially (4)

Ross

I believe the answer is:

aged

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'elderly' is the definition.
(synonyms)

I can't explain the rest of the clue.

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(Other definitions for aged that I've seen before include "Senior" , "Geriatric" , "Matured like wine in wood" , "Ripened, matured" , "Time-worn" .)

I've seen this clue in The Mirror.
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