Full dates are wrong (5)
I believe the answer is:
sated
'full' is the definition.
(thesaurus)
'dates are wrong' is the wordplay.
'are wrong' indicates an anagram.
'dates' with letters rearranged gives 'SATED'.
(Other definitions for sated that I've seen before include "Indulged to the full" , "given more than enough" , "Stuffed with food, too full" , "Stuffed, having eaten to the full" , "fully indulged" .)