Arachnids (7)
I believe the answer is:
spiders
'arachnids' is the definition.
(I know this)
This is all the clue.
(Other definitions for spiders that I've seen before include "14 [BOWIE] 's band from 26 [MARS]" , "Web weavers" , "Arachnids" , "Predators on the web" , "Insects; rests" .)