It's not sweet, sour, salty or bitter (5)

I believe the answer is:

umami

(Other definitions for umami that I've seen before include "meaty taste" , "acquired taste perhaps" , "Savoury taste sensation produced by glutamates - I, a mum (anag)" , "Japanese word for pleasant savoury taste" , "Newly discovered taste" .)

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

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