Wrong kit, names incorrect (8)
I believe the answer is:
mistaken
'incorrect' is the definition.
(similar in meaning)
'wrong kit names' is the wordplay.
'wrong' indicates anagramming the letters.
'kit'+'names'='kitnames'
'kitnames' anagrammed gives 'MISTAKEN'.
(Other definitions for mistaken that I've seen before include "Wrong-headed" , "In error in mankiest way" , "'Wrong, misguided (8)'" , "Erroneous" , "Wrong in opinion, judgment etc." .)