Tennis champion in revolutionary show exuding energy (5)
I believe the answer is:
laver
'tennis champion' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'revolutionary show exuding energy' is the wordplay.
'revolutionary' becomes 'lave' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'show' becomes 'ER' (US medical drama).
'exuding' indicates named letters should be taken away.
'energy' becomes 'e' (physics symbol as in E=mca).
'er' with 'e' removed is 'r'.
'lave'+'r'='LAVER'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for laver that I've seen before include "Wimbledon champ" , "Rod - - (tennis)" , "Edible seaweed" , "Tennis player" .)