Provoke fresh demand (6)
I believe the answer is:
madden
'provoke' is the definition.
(I know that madden is a more specific form of the action anger)
'fresh demand' is the wordplay.
'fresh' indicates an anagram (a fresh re-ordering of the letters).
'demand' anagrammed gives 'MADDEN'.
(Other definitions for madden that I've seen before include "Inflame or enrage" , "Demand (anag)" , "Enrage, make furious" , "Make very angry, even insane (6)" , "anger" .)