Cryptic crossword clue
Part of a matrix shown by u-boat’s speed 8

The most common and most likely answer to this crossword clue is the 8 letter word SUBSPACE

I've seen this crossword clue in Independent
S
U
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P
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Buddy explains!

The straight part
We know that "Part of a matrix" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case part of a matrix = subspace.
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

SUBSPACE noun
  1. A subset of a space which is a space in its own right.
  2. Any (often unspecified) method of communicating faster than light speed.
SUBSPACE noun
  1. (BDSM) The psychological state of the submissive or "bottom" during sadomasochistic activity.

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