Language a supporter's written about king, an upright character and Egyptian genius (9)
I believe the answer is:
afrikaans
'language' is the definition.
(Afrikaans is an example)
'a supporter's written about king an upright character and egyptian genius' is the wordplay.
I cannot really see how this works, but
'a' could be 'an' and 'an' is found in the answer.
'about' could be 'a' (abbreviation in Chambers) and 'a' is present in the answer.
'king' could be 'r' (abbreviation for rex, king in Latin) and 'r' is present in the answer.
'an' could be 'i' (Roman numeral for one) and 'i' is present in the answer.
'character' could be 's' and 's' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for afrikaans that I've seen before include "Boer language" , "Dutch relative" , "Tongue used in Africa" , "Southern language derived from Dutch" .)