Batty about following a high priest (5)
I believe the answer is:
aaron
'high priest' is the definition.
(I've seen this before)
'batty about following a' is the wordplay.
'batty' becomes 'nora' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'about' shows that the letters should be reversed in order.
'following' is a charade indicator (letters next to each other).
'nora' backwards is 'aron'.
'aron' after 'a' is 'AARON'.
(Other definitions for aaron that I've seen before include "Moses's brother" , "Brother of Moses and traditional founder of Jewish priesthood" , "Brother of Moses who founded the Jewish priesthood" , "Boy" , "Brother of Moses, led the Jews to the Promised Land" .)