Plant I confused with peanut (7)
I believe the answer is:
petunia
'plant' is the definition.
(petunia is a kind of plant)
'i confused with peanut' is the wordplay.
'confused with' indicates anagramming the letters.
'i' anagrammed with 'peanut' makes 'PETUNIA'.
(Other definitions for petunia that I've seen before include "Common bedding plant" , "Flower much used in hanging baskets" , "Common garden plant" , "Plant related to tobacco" , "Colourful" .)