Crossword Genius

Instrument heard at a ballpark (5)

Ross

I believe the answer is:

organ

(Other definitions for organ that I've seen before include "Brain, for example - instrument" , "Word after "pipe" or "barrel"" , "notes issue from this" , "Newspaper; instrument" , "Eg, heart, liver" .)

I've seen this clue in The New York Times.
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