An Irishman seen in racial category (5)
I believe the answer is:
aryan
'in racial category' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'an irishman' is the wordplay.
'an' becomes 'a'.
'irishman' becomes 'ryan' (I've seen this before).
'a'+'ryan'='ARYAN'
'seen' is the link.
Can you help me to learn more?
(Other definitions for aryan that I've seen before include "Of hte Indo-European language family" , "Nazi ideal" , "Ancient language" , "Ancient Indo-European" , "Early Indo-European language" .)