Credulous (5)
'credulous' is the definition.
(I've seen this before)
This is the entire 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" .)
'credulous' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for trusting that I've seen before include "Unguarded" , "Not suspicious" , "Inclined to believe" .)
'credulous' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for wide-eyed that I've seen before include "Inexperienced; showing amazement" , "Innocent - believing" , "Showing great surprise" .)
'credulous' is the definition.
(associated in meaning)
This is the entire clue.
(Other definitions for naive that I've seen before include "Inexperienced, innocent" , "Showing lack of experience or sophistication" , "Unaffected or guileless" , "Too innocent or gullible" , "childlike" .)