Chip in, perhaps (5,2)
I believe the answer is:
stump up
'chip' is the definition.
Both the answer and definition are verbs in their base form.
Perhaps 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 stump up that I've seen before include "Pay (the money required) (colloq.)" , "is what an umpire draws, at the end of the day" , "Pay one's dues" , "make payment" , "Arrive on wooden leg" .)