Creepy-crawlies (4)
I believe the answer is:
bugs
'creepy-crawlies' is the definition.
(creepy-crawlies can mean bugs, worms etc)
This is the entire clue.
(Other definitions for bugs that I've seen before include "Program errors" , "Insects or defects in computer programs" , "Software problems" , "Insects or faults in a system or machine" , "Small crawling creatures or disease-germs" .)