Cryptic crossword clue
Pace picked up, with each occupying certain trenches? 4-3

The most common and most likely answer to this crossword clue is the 8 letter word DEEP-SEA

I've seen this crossword clue in The Times
D
E
E
P
-
S
E
A


Buddy explains!

The straight part
We know that "certain trenches?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case certain trenches? = deep-sea.
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 DEEP-SEA mean?

DEEP-SEA adjective
  1. Of, related to or located in the deeper part of the sea
  2. (sport fishing) of or related to open sea
  3. (of a port) able to accommodate the largest ships.

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