Perhaps bladder is a music-maker? (5)
I believe the answer is:
organ
'perhaps bladder' is the definition.
(I know that urinary bladder is a type of organ with organ cavity)
'a music-maker?' is the wordplay.
I cannot really see how this works, but
'a' could be 'an' and 'an' is located in the answer.
'music' could be 'g' and 'g' is present in the answer.
The remaining letters 'or' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'is' acts as a link.
Can you help me to learn more?
(Other definitions for organ that I've seen before include "Publication - musical instrument" , "means for communicating information" , "Biological functionary" , "Part with special function" , "House journal" .)