Crossword Genius

Bug has upsetting tang (4)

Ross

I believe the answer is:

gnat

'bug' is the definition.
(I know that gnat is a type of dipteran)

'upsetting tang' is the wordplay.
'upsetting' shows that the letters should be reversed in order.
'tang' back-to-front is 'GNAT'.

'has' is the link.

(Other definitions for gnat that I've seen before include "Small biting flying insect" , "Small (swarming) fly" , "a little bit of a nuisance" , "Stinging insect" , "Tang (anag.)" .)

I've seen this clue in The Mirror.
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