A sort of squashed gnat flavour? (4)

I believe the answer is:

tang

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'flavour?' is the definition.
('tang' can be a synonym of 'flavour')

'a sort of squashed gnat' is the wordplay.
'gnat' can be anagrammed to 'TANG'.
Though, I am not clear how this is indicated.

Can you help me to learn more?

(Other definitions for tang that I've seen before include "Bite" , "relish" , "Strong flavour/smell" , "Tart taste and Chinese dynasty" , "Strong flavour" .)

I've seen this clue in the Evening Standard.

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