Outstanding result of love taking wing (5)
I believe the answer is:
owing
'outstanding' is the definition.
(an outstanding bill is still owing)
'love taking wing' is the wordplay.
'love' becomes 'o' (love means zero in tennis).
'taking' says to put letters next to each other.
'o'+'wing'='OWING'
'result of' is the link.
(Other definitions for owing that I've seen before include "(Of money) outstanding" , "Still outstanding" , "Unpaid" , "Undischarged" , "This debt has yet to be paid" .)