Crossword Genius

Sad, unlike Edith Piaf? (9)

Ross

I believe the answer is:

regretful

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'sad' is the definition.
(similar in meaning)

I cannot understand how the remainder of the clue works.

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(Other definitions for regretful that I've seen before include "Wishing something hadn't happened" , "Feeling remorse" , "Miss Otis was" , "Feeling sorry, repentant" , "but not Ms Piaf" .)

I've seen this clue in The Times.
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