Crossword Genius

Military slang for an arduous trek (4)

Ross

I believe the answer is:

yomp

(Other definitions for yomp that I've seen before include "Military trek" , "March with heavy equipment over difficult terrain" , "Make difficult march" , "(Of soldier) march with heavy equipment" , "March carrying full kit" .)

I've seen this clue in The Sunday Times and The Times.
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