Revolutionary annoyed relief organisation (3,5)
I believe the answer is:
red cross
'relief organisation' is the definition.
(I've seen this before)
'revolutionary annoyed' is the wordplay.
'revolutionary' becomes 'red'.
'annoyed' becomes 'cross' (I've seen this before).
'red'+'cross'='RED-CROSS'
(Other definitions for red cross that I've seen before include "Emergency organisation" , "International oranisation for treatment of wounded in war" , "Medical group" , "International organisation to help wounded in war" , "International team" .)