Caretaker one taking work unit into clubs some time ago (9)
I believe the answer is:
concierge
'caretaker' is the definition.
(I know that Concierge is a type of caretaker)
'one taking work unit into clubs some time ago' is the wordplay.
'one' becomes 'i' (Roman numeral).
'taking work unit' becomes 'erg' (I can't justify this - if you can you should give a lot more credence to this answer).
'into' indicates putting letters inside.
'clubs' becomes 'c' (abbreviation used in card games such as bridge).
'some time ago' becomes 'once' (I've seen this in another clue).
'i'+'erg'='ierg'
'c'+'once'='conce'
'ierg' put into 'conce' is 'CONCIERGE'.
Can you help me to learn more?
(Other definitions for concierge that I've seen before include "Resident French caretaker" , "Hall porter" , "Doorkeeper of hotel or apartment building" , "Interactive computer display" , "Caretaker's" .)