Landlord's sign (2,3)
I believe the answer is:
to let
'landlord's sign' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for to let that I've seen before include "Sign on property available to rent" , "Sign of the property market" , "Available for hire" , "Available for renting" , "Available for a tenant" .)