Mostly useless about missing staff turning up in city (10)
I believe the answer is:
dusseldorf
'city' is the definition.
(Dusseldorf is an example)
'mostly useless about missing staff turning up' is the wordplay.
I cannot quite see how this works, but
'useless' could be 'us' (abbreviation for unserviceable) and 'us' is located in the answer.
This may be the basis of clue (or it may be nonsense).
'in' is the link.
Can you help me to learn more?
(Other definitions for dusseldorf that I've seen before include "Capital of North Rhine-Westphalia" , "Industrial city of North Rhine-Westphalia" , "German city on Rhine" .)