Scorpion or mite, eg (8)
I believe the answer is:
arachnid
This clue is a double definition.
'scorpion' is the first definition.
(thesaurus)
'mite eg' is the second definition.
(mite is a kind of arachnid)
(Other definitions for arachnid that I've seen before include "Mite or tick, for example" , "tick for one" , "Group including spiders and scorpions" , "Class of animals including spiders and scorpions" , "Animal class including spider, scorpion etc" .)