Prophet starts to enforce demands and become angry (3,3)
I believe the answer is:
see red
'become angry' is the definition.
(I've seen this in another clue)
'prophet starts to enforce demands' is the wordplay.
'prophet' becomes 'seer' (both can mean someone who tells the future).
'starts to' suggests taking the first letters.
The initial letters of 'enforce demands' is 'ed'.
'seer'+'ed'='SEE RED'
'and' is the link.
(Other definitions for see red that I've seen before include "blow a gasket" , "Become angry as bull might" , "Be suddenly angry, as bull might" , "Become angry (colloq.)" , "Lose temper like enraged bull" .)