My job is getting harder! (7)
I believe the answer is:
setting
This clue is a double definition.
'my job' is the first definition.
(the crossword setter's job)
'getting harder' is the second definition.
'is' acts as a link.
(Other definitions for setting that I've seen before include "Writing puzzles, perhaps" , "Dropping beneath the horizon" , "making up a crossword puzzle" , "Musical version of song" , "Where one may find Ruby" .)