A bad pun can induce one (5)

I believe the answer is:

groan

(Other definitions for groan that I've seen before include "Expression of pain or disapproval" , "Sound of pain or despair" , "Sound pained; Gormenghast earldom" , "Sound of one in pain" , "Sound of pain or disapproval" .)

I've seen this clue in the Universal.

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