Pitching aid? (5)
I believe the answer is:
tuner
(Other definitions for tuner that I've seen before include "Radio receiver" , "piano man?" , "Radio adjuster" , "Motor specialist" , "Adjuster of pianos" .)
I believe the answer is:
tuner
(Other definitions for tuner that I've seen before include "Radio receiver" , "piano man?" , "Radio adjuster" , "Motor specialist" , "Adjuster of pianos" .)