Communist annoyed relief provider (3,5)
I believe the answer is:
red cross
'relief provider' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'communist annoyed' is the wordplay.
'communist' becomes 'red' (red can informally mean communist).
'annoyed' becomes 'cross' (cross can mean angry).
'red'+'cross'='RED-CROSS'
Can you help me to learn more?
(Other definitions for red cross that I've seen before include "Medical group" , "Emergency organisation" , "International humanitarian organization" , "International humanitarian organisation" , "International organisation to help wounded in war" .)