Was sorry to have made a rude noise (4)
I believe the answer is:
rued
'was sorry' is the definition.
(I've seen this before)
'rude noise' is the wordplay.
'noise' indicates a 'sounds like' (homophone) clue.
'rude' sounds like 'RUED'.
'to have made a' is the link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for rued that I've seen before include "was remorseful" , "Bitterly regretted" , "Was contrite about" , "'Regretted, repented (4)'" , "Was sorry" .)