A name is wrongly given due to forgetfulness (7)
I believe the answer is:
amnesia
'forgetfulness' is the definition.
(I've seen this before)
'a name is wrongly given' is the wordplay.
'wrongly' indicates anagramming the letters.
'given' is a charade indicator (letters next to each other).
'name'+'is'='nameis'
'nameis' anagrammed gives 'mnesia'.
'a'+'mnesia'='AMNESIA'
'due to' is the link.
(Other definitions for amnesia that I've seen before include "Recall trouble" , "Seaman I find suffering from memory loss" , "Main sea (anag.)" , "Clinical state of forgetfulness" , "Elephants won't suffer such" .)