Sea creature behaving badly, one hears, left America (8)
I believe the answer is:
nautilus
'sea creature' is the definition.
'nautilus' can be an answer for 'creature' (nautilus is a kind of creature). I am unsure of the 'sea' bit.
'behaving badly one hears left america' is the wordplay.
I cannot really see how this works, but
'one' could be 'i' (Roman numeral) and 'i' is located in the answer.
'left' could be 'l' (common abbreviation) and 'l' is present in the answer.
'america' could be 'us' (abbreviation for the United States) and 'us' is located in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for nautilus that I've seen before include "Usual tin for a small sea creature" , "Creature of deep" , "Mollusc and first nuclear-powered submarine" , "Spiral-shelled mollusc" , "Nemo's sub (Verne)" .)