The most common and most likely answer to this crossword clue is the 6 letter word STOOGE
I've seen this crossword clue in The Times
S
T
O
O
G
E
More clues leading to the result STOOGE
- Fall guy within is too gentle
- Performer’s assistant goes to pieces when given new order
- Last of jokes also recalled for one comedy partner
- Goose bumps covering either side of tight butt
- Foil lining pans too generously
- Butt of jokes is too gentlemanly, to some extent
- Poodle has goose troubled? Time to intervene
- Butt gets kicked around middle of room
- Over in Singapore, engineer makes a puppet
- Goes to shake cat's-paw
Buddy explains!

The straight part
We know that "Fall guy" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fall guy = stooge.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 STOOGE mean?
STOOGE noun- One who knowingly allows himself or herself to be used for another's profit; a dupe.
- A straight man.
- A secret informant for police.
- A confederate; a person who is secretly working for the researcher, unknown to the study participant.
- To act as a straight man.
- One who knowingly allows himself or herself to be used for another's profit; a dupe.
- A straight man.
- A secret informant for police.
- A confederate; a person who is secretly working for the researcher, unknown to the study participant.
- To act as a straight man.