Namely, wrongly sited (2,3)
I believe the answer is:
id est
'namely' is the definition.
('i.e.' or 'id est' means 'that is' or 'namely')
'wrongly sited' is the wordplay.
'wrongly' indicates an anagram (I've seen this in other clues).
'sited' with letters rearranged gives 'ID EST'.
(Other definitions for id est that I've seen before include "Namely" , "In other words" , "That is to say (Latin)" , "Ie, in full" , "ie (L)" .)