The most common and most likely answer to this crossword clue is the 7 letter word GUESTED
I've seen this crossword clue in Financial Times
G
U
E
S
T
E
D
Buddy explains!

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 GUESTED mean?
GUESTED verb- 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.