Stimulant tarnished blue tent (5,3)
I believe the answer is:
betel nut
'stimulant' is the definition.
(I've seen this before)
'tarnished blue tent' is the wordplay.
'blue tent' can be anagrammed to 'BETEL NUT'.
But, I am not sure how the anagram is indicated.
Can you help me to learn more?
(Other definitions for betel nut that I've seen before include "that's found on palm" , "Seed of a palm chewed (with its leaves) as a narcotic" , "supplies a narcotic" , "stimulant" .)