The facts seem a tad wrong (4)
I believe the answer is:
data
'the facts' is the definition.
(I've seen this in another clue)
'a tad wrong' is the wordplay.
'wrong' indicates an anagram.
'a'+'tad'='atad'
'atad' is an anagram of 'DATA'.
'seem' is the link.
This may not be right. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for data that I've seen before include "Facts given" , "Collected information" , "Collection of items of information" , "Facts and figures as processed by computer" , "Known facts" .)