The most common and most likely answer to this crossword clue is the 11 letter word PARTICIPANT
P
A
R
T
I
C
I
P
A
N
T
More clues leading to the result PARTICIPANT
- Some old company worker quietly interrupts active member
- Leave — it holds wild panic for one who’s involved
- Some international clubs yearn to bag one player
- Player in first section, cold one getting to gasp
- Quarter, say, old company factory left out is one to feature?
- Patrician involved in exercise or anybody involved in anything
- Contestant to trip captain perversely
Buddy explains!

The straight part
We know that "Contestant" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case contestant = participant.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 PARTICIPANT mean?
PARTICIPANT noun- One who participates.
- Sharing; participating; having a share of part.