Crossword Genius

Sorry when 60% of funds lost during revolutionary rule (6)

Ross

I believe the answer is:

rueful

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'sorry' is the definition.
(synonyms)

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(Other definitions for rueful that I've seen before include "Repentant" , "Melancholy" , "Full of regret" , "Regretting" , "Filled with regret" .)

I've seen this clue in The Guardian.
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