Attend to start of tennis match? (5)
I believe the answer is:
serve
This clue is a double definition.
'attend to' is the first definition.
(synonyms)
'start of tennis match?' is the second definition.
(Other definitions for serve that I've seen before include "Act as waiter" , "Dish out food" , "Answer the purpose" , "Start (tennis game)" , "Commence play in tennis" .)