Clumsy worker brings up city of birth (5)
I believe the answer is:
natal
'of birth' is the definition.
(natal means relating to birth)
'clumsy worker brings up city' is the wordplay.
'clumsy worker' becomes 'nat' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'brings up' says the letters should be written in reverse (I've seen 'bring up' mean this).
'city' becomes 'LA' (Los Angeles).
'la' written backwards gives 'al'.
'nat'+'al'='NATAL'
Can you help me to learn more?
(Other definitions for natal that I've seen before include "former SA province" , "of an ass?" , "Connected to birth" , "To do with birth - in S Africa?" , "Of or from one's birth - in S African province" .)