The most common and most likely answer to this crossword clue is the 5 letter word GUEST
I've seen this crossword clue in The Guardian
G
U
E
S
T
More clues leading to the result GUEST
- Someone invited speculation, short on time
- Visitor to the local, we hear, supposed cutting complaint right
- Visitor introduced by colleague, strangely
- Visitor supposed to speak
- Visitor reckoned to be heard
- Caller made a speculation on radio
- Leading pair abandoning the most doubtful visitor
- Patron supposed to be heard?
- In vogue, stalwart chat show participant?
- Hotel resident thought aloud
Buddy explains!

The straight part
We know that "chat show participant" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case chat show participant = guest.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 GUEST mean?
GUEST noun- A recipient of hospitality, specifically someone staying by invitation at the house of another.
- A patron or customer in a hotel etc.
- An invited visitor or performer to an institution or to a broadcast.
- A user given temporary access to a system despite not having an account of their own.
- Any insect that lives in the nest of another without compulsion and usually not as a parasite.
- An inquiline.
- To appear as a guest, especially on a broadcast
- As a musician, to play as a guest, providing an instrument that a band/orchestra does not normally have in its line up (for instance, percussion in a string band)
- To receive or entertain hospitably.