Crossword Genius

Tough march (4)

Ross

I believe the answer is:

yomp

(Other definitions for yomp that I've seen before include "Walk carrying heavy equipment (military sl.)" , "March with heavy equipment over difficult terrain" , "Make difficult march" , "March laden" , "(Of soldier) march with heavy equipment" .)

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