Impolite daughter taken down felt remorse (4)
I believe the answer is:
rued
'felt remorse' is the definition.
(I've seen this in another clue)
'impolite daughter taken down' is the wordplay.
'impolite' becomes 'rude' (similar in meaning).
'daughter' becomes 'd' (genealogical abbreviation).
'taken' suggests deleting specific letters.
'down' becomes 'd'.
'rude' with 'd' taken away is 'rue'.
'rue'+'d'='RUED'
(Other definitions for rued that I've seen before include "Was contrite about" , "Was sorry" , "Bitterly regretted" , "was remorseful" , "'Regretted, repented (4)'" .)