Incorrect kit means trouble (8)
I believe the answer is:
mistaken
'incorrect' is the definition.
(I know that incorrect can be written as mistaken)
'kit means trouble' is the wordplay.
'trouble' is an anagram indicator.
'kit'+'means'='kitmeans'
'kitmeans' with letters rearranged gives 'MISTAKEN'.
(Other definitions for mistaken that I've seen before include "Wrong in opinion, judgment etc." , "'Wrong, misguided (8)'" , "Erroneous" , "Wrong, incorrect" , "Wrongly understood" .)