Reprimand for small complaint (5)
I believe the answer is:
scold
'reprimand' is the definition.
(I know that reprimand can be written as scold)
'small complaint' is the wordplay.
I cannot quite see how this works, but
'small' could be 's' (abbreviation - e.g. clothes size) and 's' is located in the answer.
'complaint' could be 'cold' (cold is a kind of disease) and 'cold' is found within the answer.
This accounts for all the letters.
This explanation may well be incorrect...
'for' acts as a link.
Can you help me to learn more?
(Other definitions for scold that I've seen before include "Rate" , "Upbraid" , "Chide - fishwife" , "Censure, berate" , "Castigate" .)