Furtive type (5)
I believe the answer is:
sneak
'furtive type' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sneak that I've seen before include "Go furtively - inform on another child" , "Creep" , "Steal" , "Prowl" , "Slink, skulk; tell tales" .)