Queen of Carthage swindled by love (4)
I believe the answer is:
dido
'queen of carthage' is the definition.
(I've seen this before)
'swindled by love' is the wordplay.
'swindled' becomes 'did' (I've seen this before).
'by' is a charade indicator (letters next to each other).
'love' becomes 'o' (love means zero in tennis).
'did'+'o'='DIDO'
(Other definitions for dido that I've seen before include "Carthaginian queen linked to Aeneas" , "Character in Purcell opera" , "Former queen of Carthage" , "Lover of Aeneas" , "---- and Aeneas, opera by Purcell" .)