Means to regain past job? Cut down unction about head of Personnel (13)
I believe the answer is:
reappointment
'head of personnel' is the definition.
The definition suggests a singular noun which matches the answer.
'means to regain past job? cut down unction about' is the wordplay.
I cannot quite see how this works, but
'job?' could be 'appointment' (appointment is a kind of job) and 'appointment' is found within the answer.
'about' could be 're' ('re' means regarding or about) and 're' is present in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Another definition for reappointment that I've seen is " Return to old job".)