Piercing sound of monkey in poor health (8)
I believe the answer is:
impaling
'piercing' is the definition.
(impaling is a kind of piercing)
'sound of monkey in poor health' is the wordplay.
I cannot quite see how this works, but
'monkey' could be 'imp' (synonyms) and 'imp' is found in the answer.
'in' is found in the answer.
The remaining letters 'alg' 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).
Can you help me to learn more?
(Other definitions for impaling that I've seen before include "16 [PIERCING]" , "Spitting" .)