The most common and most likely answer to this crossword clue is the 6 letter word MUPPET
I've seen this crossword clue in Financial Times
M
U
P
P
E
T
More clues leading to the result MUPPET
- Fool playing up-tempo endlessly
- Animal, maybe male, raised by Paddy
- Idiot happy with parking in force
- Fool shows hesitation over prince’s favourite
- Animal put MEP in turmoil
- Dumbo is a character controlled by others
- . Foolish person ran across to restrain agitated pup
- Fool increased pressure to cut some police
- Jerk damaged case of the pump
- Fool married to a total sulk
Buddy explains!

The straight part
We know that "Idiot" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case idiot = muppet.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 MUPPET mean?
MUPPET noun- (Eastern US) An incompetent or foolish person.