It's in Kent, perhaps, that you'll find this little creature (6)
I believe the answer is:
kitten
'little creature' is the definition.
(I know that kitten is a type of young mammal)
'it's in kent perhaps' is the wordplay.
'in' indicates putting letters inside.
'perhaps' indicates anagramming the letters.
'kent' is an anagram of 'kten'.
'it' going within 'kten' is 'KITTEN'.
'that you'll find this' acts as a link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for kitten that I've seen before include "youngster" , "New cat" , "Immature cat" , "found in litter" , "Beatrix Potter's Tom, say" .)