Beast shaming couple filled with desire (5)
I believe the answer is:
hyena
'beast' is the definition.
(I've seen this before)
'shaming couple filled with desire' is the wordplay.
'shaming couple' becomes 'ha' (I can't explain this - if you can you should give a lot more credence to this answer).
'filled with' is an insertion indicator.
'desire' becomes 'yen' (yen can mean a longing or desire).
'ha' enclosing 'yen' is 'HYENA'.
Can you help me to learn more?
(Other definitions for hyena that I've seen before include "one may be spotted" , "Scavenging carnivore" , "Laughing mammal?" , "One laughs loud" , "Creature" .)