High priest's signifier of rank (6)
I believe the answer is:
stripe
'signifier of rank' is the definition.
(eg a stripe on a military uniform)
'high priest's' is the wordplay.
'high' indicates an anagram (can mean drunk or on drugs and hence disordered).
'priest' anagrammed gives 'STRIPE'.
(Other definitions for stripe that I've seen before include "Band of colour - 3 of rank" , "promotion, maybe" , "Piece of braid indicating military rank" , "Braid showing military rank" , "Long narrow mark found in tripes" .)