Pal to move out of Central Park development with unreasonably high rate (4-4)
I believe the answer is:
rack-rent
'unreasonably high rate' is the definition.
The definition suggests a singular noun which matches the answer.
'pal to move out of central park development' is the wordplay.
I cannot quite see how this works, but
'move' could be 'rack' (rack is a kind of move) and 'rack' is present in the answer.
The remaining letters 'rent' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'with' is the link.
Can you help me to learn more?
(Other definitions for rack-rent that I've seen before include "Excessively high charge by landlord" , "Extortionate payment demanded from a tenant" , "What a predatory landlord charges" , "Extortionate amount charged for letting" .)