Chore at hand (4)
I believe the answer is:
task
'chore at hand' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for task that I've seen before include "Difficult piece of work" , "Burden with work" , "Job of work" , "Piece of work to be done" , "Arduous bit of work" .)