A squashed gnat could spoil the flavour (4)

I believe the answer is:

tang

I'm a little stuck... Click here to teach me more about this clue!

'the flavour' is the definition.
(synonyms)

'a squashed gnat could spoil' is the wordplay.
'gnat' anagrams to 'TANG'.
However, I am unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for tang that I've seen before include "Old dynasty" , "Bitter aftertaste - prong" , "Thrash with good" , "Strong, pungent taste" , "characteristic quality" .)

I've seen this clue in the Evening Standard.

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.