Letter to innkeeper (8)
I believe the answer is:
landlord
I believe this is a double definition.
'letter' is the first definition.
(I've seen this before)
'innkeeper' is the second definition.
(I've seen this before)
'to' is the link.
(Other definitions for landlord that I've seen before include "He rents land or premises" , "ones under the table he might throw out" , "Mein host" , "Pub manager" , "One renting out property" .)