Lease signer (6)
I believe the answer is:
tenant
'lease signer' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for tenant that I've seen before include "his flat?" , "One who pays rent" , "Property renter" , "Rent-payer" , "Anne Bronte's novel 'The ...... of Wildfell Hall'" .)