Complaint said to be a bit hackneyed (4)
I believe the answer is:
acne
'complaint' is the definition.
(acne is a kind of disease)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for acne that I've seen before include "Face problems" , "(Inflammation causing) spots" , "Teenage skin blemish" , "Teenage spots" , "Spotty skin condition" .)