Animal with plenty to keep quiet about? (5)
I believe the answer is:
sloth
'animal' is the definition.
(sloth is a kind of animal)
'plenty to keep quiet about?' is the wordplay.
'plenty' becomes 'lot' (I can't explain this - if you can you should give a lot more credence to this answer).
'to keep quiet' becomes 'sh' (as in shushing someone).
'about?' is an insertion indicator.
'lot' inserted within 'sh' is 'SLOTH'.
'with' acts as a link.
Can you help me to learn more?
(Other definitions for sloth that I've seen before include "Deadly sin - upside-down mammal" , "Aversion to industry" , "Indolence" , "Arboreal animal" , "One of the seven deadly sins" .)