Working somewhere that's a hive of activity? (4,2,1,3)
I believe the answer is:
busy as a bee
'working' is the definition.
Both the answer and definition are adjectives.
Perhaps they are linked in a way I don't understand?
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for busy as a bee that I've seen before include "Of one very industrious" , "In a hive of activity?" .)