Nonsense! Hit the ball to one side (6)
I believe the answer is:
drivel
'nonsense' is the definition.
(drivel can mean nonsensical speech or writing)
'hit the ball to one side' is the wordplay.
'hit the ball' becomes 'drive' (I am not sure about this - if you are sure you should believe this answer much more).
'to one side' becomes 'l' (abbreviation for left).
'drive'+'l'='DRIVEL'
Can you help me to learn more?
(Other definitions for drivel that I've seen before include "Worthless, foolish nonsense" , "Silly talk, twaddle" , "Tosh" , "Cobblers" , "Worthless talk" .)