Feeling regret (5)

I believe the answer is:

sorry

'feeling regret' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for sorry that I've seen before include "Feeling regret" , "Feeling penitent" , "Feeling penitence" , "I beg your pardon" , "Repentant" .)

I've seen this clue in the Jonesin', The Guardian, the Penny Press, the Newsday.com, the Jonesin Crosswords and The Times.

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