The most common and most likely answer to this crossword clue is the 11 letter word CHIMPANZEES
I've seen this crossword clue in The Daily Telegraph
C
H
I
M
P
A
N
Z
E
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S
Buddy explains!
The straight part
We know that "Troop members" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case troop members = chimpanzees.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 CHIMPANZEES mean?
CHIMPANZEES noun- A species of great ape in the genus Pan, native to Africa, and believed by biologists to be the closest extant relative to humans.