Goober (6)
'goober' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for peanut that I've seen before include "Dry-roasted or salted snack item" , "Seed also known as a goober" , "Edible seed of Arachis hypogaea" , "Leguminous seed eaten as snack or butter" , "Eat pun for the hard fruit" .)
(Another definition for dork that I've seen is " Socially inept person (US slang)".)