Try a test, perhaps (5)
I believe the answer is:
taste
'try' is the definition.
(synonyms)
'a test perhaps' is the wordplay.
'perhaps' indicates an anagram.
'a'+'test'='atest'
'atest' is an anagram of 'TASTE'.
(Other definitions for taste that I've seen before include "Liking (for)" , "eat only the smallest amount" , "Savour; discernment" , "Gustatory sensation" , "Savour, relish" .)