Tuba sound (3)
'tuba sound' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for oompah that I've seen before include "Deep-toned noise of brass instruments" , "A Sound of Music" , "brassy sound" , "Sound of deep brass instrument (colloq.)" , "Noise of brass (colloq.)" .)
'tuba sound' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Another definition for pah that I've seen is " Expression of disgust".)