The most common and most likely answer to this crossword clue is the 5 letter word MIMES
M
I
M
E
S
Buddy explains!
The straight part
We know that "works leaving everyone speechless" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case works leaving everyone speechless = mimes.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 MIMES mean?
MIMES noun- A form of acting without words; pantomime.
- A pantomime actor.
- A classical theatrical entertainment in the form of farce.
- A performer of such a farce.
- A person who mimics others in a comical manner.
- Any of various papilionid butterflies of the genus Chilasa or Papilio, that mimic other species in appearance.
- To mimic.
- To act without words.
- To represent an action or object through gesture, without the use of sound.