Easily fooled (8)
I believe the answer is:
gullible
'easily fooled' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for gullible that I've seen before include "Easily deceived, naive" , "Easily taken in, too quick to believe" , "Credulous, easily deceived" , "Easily fooled" , "Naive and easily tricked" .)