Beast should be good for a laugh (5)
I believe the answer is:
hyena
'beast' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for hyena that I've seen before include "African scavenger" , "Wolf-like animal with cry like laughter" , "Dog-like scavenger" , "Afr. doglike carnivore" , "Its howl sounds like laughter" .)