A group of six tsetse flies (6)

I believe the answer is:

sestet

'a group of six' is the definition.
(I've seen this before)

'tsetse flies' is the wordplay.
'flies' is an anagram indicator.
'tsetse' is an anagram of 'SESTET'.

(Other definitions for sestet that I've seen before include "Group of six" , "Tsetse (anag.)" , "Six together" , "Set of six performers" , "musical ensemble" .)

I've seen this clue in The Telegraph.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.