Top player foolish losing heart with racket? (7)
I believe the answer is:
noisily
'with racket?' is the definition.
(in a way that makes a noise or racket)
'top player foolish losing heart' is the wordplay.
'top player' becomes 'noi' (I can't explain this - if you can you should give a lot more credence to this answer).
'foolish' becomes 'silly' (similar in meaning).
'losing heart' says to hollow out the word (remove centre letters).
'silly' with its centre removed is 'sily'.
'noi'+'sily'='NOISILY'
Can you help me to learn more?
(Other definitions for noisily that I've seen before include "making a din" , "in loud manner" , "Unpleasantly loudly" , "Rowing thus" , "With much loud sound" .)