Nobleman finding love in farm building (5)
I believe the answer is:
baron
'nobleman' is the definition.
(baron is a kind of nobleman)
'love in farm building' is the wordplay.
'love' becomes 'o' (love means zero in tennis).
'in' means one lot of letters goes inside another.
'farm building' becomes 'barn' (barn is a kind of farm building).
'o' put into 'barn' is 'BARON'.
'finding' is the link.
(Other definitions for baron that I've seen before include "An English lord or a magnate" , "Aristocratic title" , "Nobleman providing a portion of beef" , "Minor noble" , "Minor nobleman" .)