Cryptic crossword clue
Trenches so safe when there’s been an upheaval 6

The most common and most likely answer to this crossword clue is the 6 letter word FOSSAE

I've seen this crossword clue in The Guardian
F
O
S
S
A
E

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The straight part
We know that "Trenches" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case trenches = fossae.
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 FOSSAE mean?

FOSSAE noun
  1. A pit, groove, cavity, or depression.
  2. A long, narrow, shallow depression on the body of an extraterrestrial body, such as a planet or moon.

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