Neither severe nor bitter (4)
I believe the answer is:
mild
'bitter' 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 "Calm" , "Gentle - bland" , "Clement -- type of beer" , "Gentle and moderate" , "Beer darker than bitter - not bitter" .)