Scavenger's expression of contempt about money (5)
I believe the answer is:
hyena
'scavenger's' is the definition.
(I've seen this before)
'expression of contempt about money' is the wordplay.
'expression of contempt' becomes 'ha' (ha may be said scornfully or with contempt).
'about' means one lot of letters goes inside another.
'money' becomes 'yen' (Japanese currency).
'ha' enclosing 'yen' is 'HYENA'.
(Other definitions for hyena that I've seen before include "Wild mammal" , "He's sometimes spotted" , "Scavenging animal" , "Afr. doglike carnivore" , "Dog-like carrion-feeding mammal" .)