Dealt with by the worker who came to the fore (7)
I believe the answer is:
handled
'dealt with by the worker who came to the fore' is the definition.
'handled' can be an answer for 'dealt with' (I've seen this in another clue). I'm unsure of the remainder of the definition.
'dealt with by the worker' is the wordplay.
'dealt with' says to put letters next to each other (some letters placed down or dealt alongside others).
'by' becomes 'led' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'the worker' becomes 'hand' (hand is a kind of worker).
'led' put after 'hand' is 'HANDLED'.
Can you help me to learn more?
(Other definitions for handled that I've seen before include "managed" , "Coped with" , "Touched - held" , "Dealt with" .)