Crossword Genius

Fly from a mixed double set (6)

Ross

I believe the answer is:

tsetse

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'fly' is the definition.
(biting fly found in tropical Africa)

'a mixed double set' is the wordplay.
I cannot really understand how this works, but
an anagram of 'set' is 'tse' which is located in the answer.
The remaining letters 'tse' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

'from' acts as a link.

Can you help me to learn more?

(Other definitions for tsetse that I've seen before include "flies" , "Bloodsucking African fly" , "African transmitter" , "fly across Africa" , "source of sleeping sickness" .)

I've seen this clue in The Globe and Mail.
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