Listen, cheese is emitting unpleasant odour (6)
I believe the answer is:
stench
'unpleasant odour' is the definition.
(I've seen this before)
'listen cheese is emitting' is the wordplay.
'STENCH' is hidden in amongst the letters.
However, I am not sure how this is indicated.
Can you help me to learn more?
(Other definitions for stench that I've seen before include "Foul odour" , "Strong unpleasant smell" , "smell, to put it mildly" , "Stink" , "Horrible smell" .)