Food sample (5)
I believe the answer is:
taste
'food sample' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for taste that I've seen before include "Appreciation, discernment" , "one of the 4 [SENSE] s" , "Discrimination - a sense" , "Sample - discrimination" , "Sensation of flavour" .)