Establish a lead in tennis (3,2)
I believe the answer is:
set up
'establish' is the definition.
(I know that establish can be written as set up)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for set up that I've seen before include "An arrangement designed to trap or cheat" , "Fool" , "Arrangement; trick" , "a useful situation at tennis?" , "advantageous position at Wimbledon?" .)