I am a droll, peculiar creature (9)
I believe the answer is:
armadillo
'creature' is the definition.
(armadillo is a kind of creature)
'i am a droll peculiar' is the wordplay.
'peculiar' indicates anagramming the letters.
'i'+'am'+'a'+'droll'='iamadroll'
'iamadroll' with letters rearranged gives 'ARMADILLO'.
(Other definitions for armadillo that I've seen before include "Long-snouted animal" , "Bony-plated insectivore" , "armour-plated type" , "Insect-eating mammal" , "Insectivorous mammal" .)