
1) Carnatic music instrument
Found on
https://www.crosswordclues.com/clue/ottu
[instrument] The ottu (or otter) is a double reed wind instrument, used in Carnatic music of Southern India to provide a drone accompaniment to the similar nadaswaram oboe. Like the nadaswaram, the ottu is a large conical instrument, some two and a half feet long. Unlike the nadaswaram, the ottu has no fingerholes, being intended to produce...
Found on
http://en.wikipedia.org/wiki/Ottu_(instrument)

(from the article `nagaswaram`) ...nose while expelling air from the cheeks into the instrument, to create a continuous melody. Sometimes several players alternate on the melodic ...
Found on
http://www.britannica.com/eb/a-z/o/39
No exact match found.