A sedentary occupation (3-2)
I believe the answer is:
sit-in
'a sedentary occupation' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe they are linked in a way I don't understand?
This is the entire clue.
Can you help me to learn more?
(Other definitions for sit-in that I've seen before include "Act of civil disobedience" , "Form of civil disobedience" , "Type of protest" , "Passive occupation of a premises" , "Organised passive protest" .)