Misty (4)
I believe the answer is:
hazy
'misty' is the definition.
(I know that misty can be written as hazy)
This is the entire clue.
(Other definitions for hazy that I've seen before include "Not clear" , "Vague, ill-defined" , "Blurred" , "Slightly misty, vague" , "Affected by mist - indistinct" .)