Spirit produced by good landlord (5)
I believe the answer is:
ghost
'spirit' is the definition.
(spirit can mean a ghost)
'by good landlord' is the wordplay.
'by' means one lot of letters go next to another.
'good' becomes 'g' (abbreviation).
'landlord' becomes 'host' (host can mean a landlord).
'g' put next to 'host' is 'GHOST'.
'produced' acts as a link.
(Other definitions for ghost that I've seen before include "Apparition; faint trace" , "suggestion" , "A spirit from the beyond" , "insubstantial presence" , "Author, secretly" .)