One avoids convenience available at a price (2,3)
I believe the answer is:
to let
'price' is the definition.
The definition and answer can be both to do with ownership as well as being verbs in their base form.
Maybe they are linked in a way I don't understand?
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for to let that I've seen before include "Available for a tenant" , "Sign of the property market" , "open to offers" , "Notice of vacancy" , "Sign on property available to rent" .)