Announced prophet's brand (4)
I believe the answer is:
'brand' is the definition.
(both can mean to burn)
'announced prophet's' is the wordplay.
'announced' indicates a 'sounds like' (homophone) clue.
'prophet' becomes 'seer' (I've seen this before).
'seer' sounds like 'SEAR'.
(Other definitions for sear that I've seen before include "Scorch or burn the surface of", "Burn briefly", "Cauterise", "Withered", "Make very hot and dry".)