Crossword Genius

Regret extremely deficient gruel (3)

Ross

I believe the answer is:

rue

'regret' is the definition.
(synonyms)

'extremely deficient gruel' is the wordplay.
'extremely deficient' says to take the centre.
The central letters of 'gruel' are 'RUE'.

(Other definitions for rue that I've seen before include "Regret in a French street" , "Swann's way?" , "Fish eggs" , "Feel regret for the herb" , "repentance" .)

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