Sweet creature, we hear (6)
I believe the answer is:
mousse
'sweet' is the definition.
(I know that mousse is a type of sweet)
'creature we hear' is the wordplay.
'creature' becomes 'moose' (type of animal).
'we hear' shows a homophone (sound like).
'moose' is a homophone of 'MOUSSE'.
(Other definitions for mousse that I've seen before include "Creamy substance used for styling hair" , "Creamy dessert; hair dressing" , "Creamy dish" , "Light creamy dessert, set with gelatin" , "Foamy hair preparation" .)