The most common and most likely answer to this crossword clue is the 4 letter word YOMP
Y
O
M
P
More clues leading to the result YOMP
Buddy explains!
The straight part
We know that "to make progress in tricky conditions" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case to make progress in tricky conditions = yomp.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
Crossword Answer definitions
YOMP noun- A long-distance march carrying full kit.
- To make a strenuous long-distance march.