Ex-Wimbledon champ on team (7)

I believe the answer is:

everton

I'm a little stuck... Click here to teach me more about this clue!

'team' is the definition.
(I've seen this before)

'ex-wimbledon champ on' is the wordplay.
'ex wimbledon champ' becomes 'evert' (I can't explain this - if you can you should believe this answer much more).
'evert'+'on'='EVERTON'

Can you help me to learn more?

(Other definitions for everton that I've seen before include "N. England football club" , "One side in blue" , "Merseyside soccer team" , "Liverpool football team" , "Liverpool football club" .)

I've seen this clue in The Telegraph.

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