Crossword Genius

Lamented disrespectful daughter moving east (4)

Ross

I believe the answer is:

rued

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

I cannot understand how the rest of the clue works.

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

I've seen this clue in The Guardian.
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