Crossword Genius

Regret one magpie may be for it? (6)

Ross

I believe the answer is:

sorrow

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'regret' is the definition.
(I know that regret can be written as sorrow)

I can't explain the remainder of the clue.

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(Other definitions for sorrow that I've seen before include "Deep distress" , "Sadness,regret" , "Deep sadness" , "Expression of grief" , "'Sadness, grief (6)'" .)

I've seen this clue in The Times.
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