Crossword Genius

Growing regret? (3)


I believe the answer is:


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This might be a double definition.

'growing' is the first definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'regret?' is the second definition.
(to rue something is to regret it)

Can you help me to learn more?

(Other definitions for rue that I've seen before include "Regret the bitter herb" , "Wish not to have been" , "At one time, pity" , "Repentant sort of shrub?" , "Regret or repent" .)

I've seen this clue in the Evening Standard.
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