The most common and most likely answer to this crossword clue is the 6 letter word FISHER
I've seen this crossword clue in The Times
F
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S
H
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R
More clues leading to the result FISHER
Buddy explains!

The straight part
We know that "Person seen as unusual confronting monarch" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case person seen as unusual confronting monarch = fisher.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 FISHER mean?
FISHER noun- A person who catches fish, especially for a living or for sport.
- A person attempting to catch fish.
- A North American marten, Martes pennanti, that has thick brown fur.
- The fur of Martes pennanti.