Bad reaction to engineered cell in Baltic city (8)
I believe the answer is:
allergic
'bad' is the definition.
Both the definition and answer are adjectives. Maybe there's a link between them I don't understand?
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for allergic that I've seen before include "Hypersensitive (to a substance)" , "Being so, one may react rashly" , "Hypersensitive (to certain substances)" , "Physically intolerant" , "Medically sensitive to" .)