Match that professional's taken to heart? (7)
I believe the answer is:
doubles
'match' is the definition.
(thesaurus)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for doubles that I've seen before include "match in court" , "Tennis match for four players" , "Made twice as much" , "Like Carton and Darnay" , "sort of game" .)