Exhausted provincial party supporting employment (4,2)
I believe the answer is:
used up
'exhausted' is the definition.
('use up' can be a synonym of 'exhaust')
'provincial party supporting employment' is the wordplay.
'provincial party' becomes 'dup' (Democratic Unionist Party. I am not sure about the 'provincial' bit.).
'supporting' is a charade indicator (letters next to each other) (in a down clue, some letters go below others).
'employment' becomes 'use' (synonyms).
'dup' after 'use' is 'USED-UP'.
Can you help me to learn more?
(Other definitions for used up that I've seen before include "Consumed completely" , "Consumed, finished" , "Spent" , "Exhausted the supply" .)