Wimbledon champion taking time to become US Grand Slammer? (8)
I believe the answer is:
alcatraz
'wimbledon' is the definition.
Both the answer and definition are singular nouns.
Maybe you can see a link between them that I don't see?
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for alcatraz that I've seen before include "Old Calif. offshore prison" , "Pen" , "US island of a former maximum-security prison" , "Once dreaded prison in San Francisco Bay" , "US island, formerly a famous prison" .)