Crossword Genius

Felt guilt about lacking etiquette in speech (4)

Ross

I believe the answer is:

rued

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'felt' is the definition.
(ruing is a kind of feeling)

I can't explain the remainder of the clue.

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(Other definitions for rued that I've seen before include "Was contrite about" , "'Regretted, repented (4)'" , "Was sorry" , "Bitterly regretted" , "was remorseful" .)

I've seen this clue in The Times.
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