A Scottish historian is clearly wrong (7)
I believe the answer is:
carlyle
'a scottish historian' is the definition.
(I've seen this before)
'clearly wrong' is the wordplay.
'wrong' indicates anagramming the letters.
'clearly' anagrammed gives 'CARLYLE'.
'is' is the link.
(Other definitions for carlyle that I've seen before include "Victorian historian" , "Scots historian" , "Thomas -, nineteenth century British essayist/historian" , "Thomas --, Scottish social historian" , "Thomas -, Sc. essayist" .)