Nasty smell from yeast in kitchen (5)
I believe the answer is:
stink
'nasty smell' is the definition.
(I've seen this before)
'from yeast in kitchen' is the wordplay.
'from' says the answer is hidden in the clue.
'STINK' can be found hidden inside 'yeast in kitchen'.
(Other definitions for stink that I've seen before include "Horrid smell" , "Hum" , "Nasty smell" , "Stench" , "Reek" .)