Manage to show love with poetry and love's ending (7)
I believe the answer is:
oversee
'manage' is the definition.
(I've seen this before)
'love with poetry and love's ending' is the wordplay.
'love' becomes 'o' (In tennis, 'love' means 'zero').
'with' is a charade indicator (letters next to each other).
'poetry' becomes 'verse' ('verse' can be a synonym of 'poetry'**).
'and' means one lot of letters go next to another.
'ending' indicates one should take the final letters.
The last letter of 'love' is 'e'.
'o'+'verse'+'e'='OVERSEE'
'to show' acts as a link.
(Other definitions for oversee that I've seen before include "Keep a check on" , "Supervise, control" , "Administer" , "Direct" , "Invigilate" .)