Source of wild laughter (5)
I believe the answer is:
hyena
'source of wild laughter' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
This is all the clue.
Can you help me to learn more?
(Other definitions for hyena that I've seen before include "he's a laugh" , "Dog-like animal with laughter-like howl" , "Wolf-like animal with cry like laughter" , "Carnivorous animal with howl like laughter" , "Dog-like carrion eater" .)