Looking wrong, yet red hair is in the family (10)
I believe the answer is:
hereditary
'in the family' is the definition.
(something hereditary runs in the family)
'looking wrong yet red hair' is the wordplay.
'looking wrong' indicates an anagram (a wrong spelling).
'yet'+'red'+'hair'='yetredhair'
'yetredhair' is an anagram of 'HEREDITARY'.
'is' acts as a link.
(Other definitions for hereditary that I've seen before include "passed down through generations" , "From ancestors" , "given by Dad?" , "Passed on by genetic factors" , "Transmitted" .)