Bigfoot relatives (5)
I believe the answer is:
yetis
'bigfoot relatives' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for yetis that I've seen before include "Rarely seen group of creatures" , "Abominable snowmen" , "fantastic beasts" , "Mountain monsters" , "Beasts that aren't real" .)