This largely describes potatoes (3)

I believe the answer is:

old

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'this largely describes potatoes' is the definition.
The definition suggests a singular noun which matches the answer.

This is all the clue.

(Other definitions for old that I've seen before include "Venerable" , "SECOND PART OF 14" , "Elderly" , "Long-lived" , "out of the ark" .)

I've seen this clue in the Evening Standard.

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