Referring to landlord in Lincoln, say (10)
I believe the answer is:
republican
'lincoln say' is the definition.
(Abraham Lincoln was a Republican president)
'referring to landlord' is the wordplay.
'referring to' becomes 're'.
'landlord' becomes 'publican' (I've seen this before).
're'+'publican'='REPUBLICAN'
'in' is the link.
(Other definitions for republican that I've seen before include "in foreign party" , "American in party" , "American politician" , "anti-monarchist" , "Member of US political party" .)