Stop seeing short, grotesque creature (6)
I believe the answer is:
goblin
'grotesque creature' is the definition.
(I've seen this before)
'stop seeing short' is the wordplay.
'stop seeing' becomes 'go blind' (to go blind is to stop seeing).
'short' means to remove the last letter.
'goblind' with its final letter taken away is 'GOBLIN'.
(Other definitions for goblin that I've seen before include "I may appear in fairy tales" , "Small grotesque sprite" , "Evil imp" , "Dwarf-like creature" , "nasty little thing" .)