Level throw (5)
I believe the answer is:
pitch
I believe this is a double definition.
'level' is the first definition.
(I have seen 'Level of sound' mean 'pitch' so perhaps 'level' could also mean 'pitch')
'throw' is the second definition.
(pitch is a kind of throw)
(Other definitions for pitch that I've seen before include "Sales talk - where games are played" , "Field of play" , "Tar; lob" , "Throw; tar" , "cast?" .)