Response to bad pun mature we hear? (5)
I believe the answer is:
groan
'response to bad pun' is the definition.
I can't judge whether this definition defines the answer.
'mature we hear?' is the wordplay.
'mature' becomes 'grown' (similar in meaning).
'we hear?' shows a homophone (sound like).
'grown' sounds like 'GROAN'.
Can you help me to learn more?
(Other definitions for groan that I've seen before include "Expression of pain or disapproval" , "Sound of one in pain" , "Cry of pain or despair" , "Moan, grumble" , "Complaint" .)