In the worker and being dealt with (2,4)
I believe the answer is:
in hand
'being dealt with' is the definition.
(I've seen this before)
'in the worker' is the wordplay.
'the worker' becomes 'hand' (hand is a kind of worker).
'in'+'hand'='IN HAND'
'and' acts as a link.
(Other definitions for in hand that I've seen before include "available" , "receiving attention" , "Ready for use; making progress" , "Some clubs may be" , "spare" .)