Gullible (5)
'gullible' is the definition.
(similar in meaning)
This is the entire clue.
(Other definitions for naive that I've seen before include "Short on experience" , "Ingenuous, easily deceived" , "Too innocent or gullible" , "Showing lack of experience or sophistication" , "Ingenuous and credulous" .)
'gullible' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for credulous that I've seen before include "Likely to believe" , "Easily fooled" , "Gullible" , "Apt to believe without sufficient evidence" , "Too ready to believe things" .)