Creepy-crawly prepared decent pie (9)
I believe the answer is:
centipede
'creepy-crawly' is the definition.
(centipede is a kind of invertebrate)
'prepared decent pie' is the wordplay.
'prepared' indicates an anagram.
'decent'+'pie'='decentpie'
'decentpie' is an anagram of 'CENTIPEDE'.
(Other definitions for centipede that I've seen before include "Multi-legged crawler" , "Many-legged insect" , "Many-legged creature" , "Small carnivore" , "One crawling" .)