Diaphragm suggesting how song may abruptly end? (7)

I believe the answer is:

midriff

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'diaphragm' is the definition.
(I know that diaphragm can be written as midriff)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for midriff that I've seen before include "Middle area of the torso" , "Diaphragm area" , "Part of body between waist and chest" , "Tummy area" , "Area between stomach and chest" .)

I've seen this clue in The Everyman puzzle in The Observer.

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