Origin of Wimbledon favourite (4)
I believe the answer is:
seed
I believe this clue is a double definition.
'origin' is the first definition.
(seed is a kind of origin)
'wimbledon favourite' is the second definition.
(tennis players are seeded)
'of' acts as a link.
(Other definitions for seed that I've seen before include "Basis for new plant" , "one of the top players" , "Drop" , "What is sown" , "Pip; tennis player" .)