Crossword Genius

Remnants of wine found in old ewers periodically (4)

Ross

I believe the answer is:

lees

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'remnants of wine' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'old ewers periodically' is the wordplay.
'periodically' indicates alternate letters (letters must be selected 'every so often').
'old'+'ewers'='oldewers'
The alternate letters of 'oldewers' are 'LEES'.

'found in' acts as a link.

Can you help me to learn more?

(Other definitions for lees that I've seen before include "Sediement or else" , "Dregs left by eels" , "Sediment from alcoholic drink" , "Dregs, sediment" , "worst part" .)

I've seen this clue in The Times.
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