The most common and most likely answer to this crossword clue is the 4 letter word RUED
I've seen this crossword clue in The Guardian
R
U
E
D
More clues leading to the result RUED
- Was unhappy about drive round much of Europe, heading west
- Regretted being impolite on the phone
- Rough getting picked up felt remorse
- Was sorry about making vulgar sound
- Changed one’s mind? Rough, by the sound of it
- Lamented disrespectful daughter moving east
- Lamented ignorant broadcast?
- Regretted being offensive on the radio
- Sounding insulting, was sorry
- Deplored coarse speaking
Buddy explains!

The straight part
We know that "Lamented" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case lamented = rued.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does RUED mean?
RUED verb- To cause to repent of sin or regret some past action.
- To cause to feel sorrow or pity.
- To repent of or regret (some past action or event); to wish that a past action or event had not taken place.
- To feel compassion or pity.
- To feel sorrow or regret.