Sense right as testing shows (5)
I believe the answer is:
taste
'sense' is the definition.
(taste is one of the five senses)
'right as testing shows' is the wordplay.
'shows' says the answer is hidden in the clue.
'TASTE' is hidden in the letters of 'right as testing'.
(Other definitions for taste that I've seen before include "Liking (for)" , "Little bit" , "Brief sample; discernment" , "Sensation in the mouth caused by food" , "style" .)