I am a droll, outlandish creature (9)
I believe the answer is:
armadillo
'creature' is the definition.
(armadillo is a kind of creature)
'i am a droll outlandish' is the wordplay.
'outlandish' indicates anagramming the letters.
'i'+'am'+'a'+'droll'='iamadroll'
'iamadroll' is an anagram of 'ARMADILLO'.
(Other definitions for armadillo that I've seen before include "American insect-eater" , "Plated burrowing animal" , "Animal covered with long plates" , "Insectivorous mammal" , "one of the Animals makes appearance" .)