Crossword Genius

One-track (4)

Ross

I believe the answer is:

mono

'one-track' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for mono that I've seen before include "Transmitting over one channel" , "Single-speaker sound" , "Single-channel sound" , "Not stereo" .)

I've seen this clue in the Newsday.
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