Cryptic crossword clue
Marching one abreast, crossing middle of hostile desert, enter secretly 10

The most common and most likely answer to this crossword clue is the 10 letter word INFILTRATE

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Buddy explains!

The straight part
We know that "enter secretly" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case enter secretly = infiltrate.
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.

What does INFILTRATE mean?

INFILTRATE noun
  1. Any undesirable substance or group of cells that has made its way into part of the body.
INFILTRATE verb
  1. To surreptitiously penetrate, enter or gain access to.
  2. (of a liquid) To pass through something by filtration.
  3. To cause (a liquid) to pass through something by filtration.
  4. To invade or penetrate a tissue or organ.
  5. To send (soldiers, spies etc.) through gaps in the enemy line.
  6. (of an intravenous needle) To move from a vein, remaining in the body.

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