Like the smell of rising dough
I believe the answer is:
yeasty
'like the smell of rising dough' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for yeasty that I've seen before include "upheaval" , "Frothy - insubstantial" , "Like taste of home brew" , "Like a fermenting agent" , "Fermenting or causing fermentation" .)