Custodian's stern self-confession about general chores? (5)
I believe the answer is:
admin
'custodian's stern' is the definition.
The definition suggests a singular noun which matches the answer.
'self-confession about general chores?' is the wordplay.
I cannot really see how this works, but
'about' could be 'a' (abbreviation in Chambers) and 'a' is found in the answer.
'general' could be 'in' (similar in meaning) and 'in' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for admin that I've seen before include "that bureaucrat handles" , "Paperwork (abbr)" , "Paperwork (informal)" , "Management (abbr.)" , "Organisation (colloq.)" .)