Bella's wrong name tab (5)
I believe the answer is:
label
'name tab' is the definition.
'label' can be an answer for 'tab' (I've seen this before). I am not sure about the 'name' bit.
'bella's wrong' is the wordplay.
'wrong' is an anagram indicator.
'bella' with letters rearranged gives 'LABEL'.
Can you help me to learn more?
(Other definitions for label that I've seen before include "Means of identifying" , "Classifying name" , "Tag; record company" , "Tag, tab" , "attachment to the Christmas parcel" .)