Four Roman cardinals get together for a beer (4)
I believe the answer is:
mild
'four' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for mild that I've seen before include "Not severe or harsh" , "old cardinals ..." , "Not intense; beer" , "Gentle - bland" , "Moderately warm - type of beer" .)