Crossword Genius

Scathing worker leaves ditch (6)

Ross

I believe the answer is:

trench

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'ditch' is the definition.
(I know that ditch can be written as trench)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for trench that I've seen before include "depression" , "A deep ditch, as dug for troops" , "Drain" , "deep channel" , "at the front" .)

I've seen this clue in the Sydney Morning Herald.
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