Creature producing noise round a lake (3,4)
I believe the answer is:
sea lion
'creature' is the definition.
(I have seen 'Marine animal' mean 'sea lion' so perhaps 'animal' could also mean 'sea lion')
'producing noise round a lake' is the wordplay.
'producing' indicates anagramming the letters.
'round' means one lot of letters goes inside another.
'lake' becomes 'L' (geographical abbreviation).
'noise' is an anagram of 'seion'.
'a'+'l'='al'
'seion' enclosing 'al' is 'SEA-LION'.
(Other definitions for sea lion that I've seen before include "Marine animal, used as a circus performer" , "Aquatic mammal - code name for planned German invasion of England, 1940" , "one often immersed in salty water" , "Large-eared marine mammal, sometimes performing" , "Large seal" .)