Wimbledon favourite has time to get mount (5)
I believe the answer is:
steed
'mount' is the definition.
(I know that steed is a type of warhorse)
'wimbledon favourite has time' is the wordplay.
'wimbledon favourite' becomes 'seed' (tennis players are seeded).
'has' indicates putting letters inside.
'time' becomes 't' (abbreviation).
'seed' enclosing 't' is 'STEED'.
'to get' acts as a link.
(Other definitions for steed that I've seen before include "Literary term for horse" , "Swift horse" , "Horse, mount" , "Warhorse" , "Trusty horse" .)