Be progressively friendly (3,2)
I believe the answer is:
get on
'be' is the definition.
The answer and definition can be both to do with social activities as well as being verbs in their base form.
Maybe they are linked in a way 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 get on that I've seen before include "Board; establish good relations" , "Board vehicle or make progress" , "Age; prosper" , "Agree - embark - make progress" , "Make progress, do well in life" .)