Regret one magpie may be for it? (6)
I believe the answer is:
sorrow
'regret' is the definition.
(I know that regret can be written as sorrow)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for sorrow that I've seen before include "Deep distress" , "Sadness,regret" , "Deep sadness" , "Expression of grief" , "'Sadness, grief (6)'" .)