Crossword Genius

Organisation that makes Communist annoyed? (8)

Ross

I believe the answer is:

redcross

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'organisation that' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'communist annoyed?' is the wordplay.
'communist' becomes 'red' (red can informally mean communist).
'annoyed?' becomes 'cross' (cross can mean angry).
'red'+'cross'='REDCROSS'

'makes' is the link.

Can you help me to learn more?

(Other definitions for redcross that I've seen before include "International organisation" , "Medical outfit" .)

I've seen this clue in The Irish News.
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