Salivation stimuli (6)
I believe the answer is:
aromas
'salivation stimuli' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for aromas that I've seen before include "Nice smells" , "Spicy fragrances" , "Sweet smells" , "Usually pleasing smells" , "Smells, pleasant perhaps" .)