Nice aroma when stirring drink (9)
I believe the answer is:
americano
'drink' is the definition.
(type of coffee drink)
'nice aroma when stirring' is the wordplay.
'when stirring' indicates anagramming the letters.
'nice'+'aroma'='nicearoma'
'nicearoma' is an anagram of 'AMERICANO'.
(Other definitions for americano that I've seen before include "Espresso diluted with hot water" , "drink" , "Style of coffee" .)