Crossword Genius

Kind of fly

Ross

I think it could be either:

Which length description are you looking for?:

3*

6*

'kind of fly' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for sac that I've seen before include "Bag-like cavity" , "Bag-like part in animal or plant" , "Membranous cavity" , "Bag-like part of the body" , "Bag, pouch; cyst" .)

I've seen this clue in The New York Times.
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