The most common and most likely answer to this crossword clue is the 7 letter word TRUDEAU
T
R
U
D
E
A
U
More clues leading to the result TRUDEAU
- Greek character’s caught insulting old PM
- Ex-PM making honest money from what’s reported
- Rideau Cottage resident audited actual money
- Briefly tense after interruption from impolite old prime minister
- Impolite to interrupt cross Canadian Prime Minister
- Prime minister discussed real money
- Real money announced for comic strip writer
- Prime Minister‘s faithful? Made out with bunny girl, reportedly
Buddy explains!

The straight part
We know that "Rideau Cottage resident" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case rideau cottage resident = trudeau.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.