Maturer models have a typo (7)
I believe the answer is:
erratum
'a typo' is the definition.
('erratum' can be a synonym of 'typo')
'maturer models' is the wordplay.
'models' indicates anagramming the letters.
'maturer' is an anagram of 'ERRATUM'.
'have' is the link.
(Other definitions for erratum that I've seen before include "Typo" , "fluff on paper" , "Printer's mistake" , "Faux pas" , "something wrong?" .)