Categorise a bell incorrectly (5)
I believe the answer is:
label
'categorise' is the definition.
(I've seen this in another clue)
'a bell incorrectly' is the wordplay.
'incorrectly' indicates an anagram (I've seen this in other clues).
'a'+'bell'='abell'
'abell' with letters rearranged gives 'LABEL'.
(Other definitions for label that I've seen before include "Classifying name" , "Identity tag" , "Means of identifying" , "Tag or designation" , "Tag or trade name" .)