'Male or female first' — person showing prejudice? (6)
I believe the answer is:
sexist
'person showing prejudice?' is the definition.
(sexism is a type of prejudice)
'male or female first' is the wordplay.
'male or female' becomes 'sex' (a person's sex).
'first' becomes 'ist' (ist resembles 1st).
'sex'+'ist'='SEXIST'
(Other definitions for sexist that I've seen before include "Displaying gender discrimination" , "Prejudiced against men or women" , "Bigot" , "Exists (anag.)" , "that's nicer to fellows?" .)