Cryptic crossword clue
Warship went down, part of larger group 6

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

I've seen this crossword clue in The Guardian
S
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B
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Buddy explains!

The straight part
We know that "part of larger group" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case part of larger group = subset.
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 SUBSET mean?

SUBSET noun
  1. (of a set S) A set A such that every element of A is also an element of S.
  2. A group of things or people, all of which are in a specified larger group.
SUBSET verb
  1. To take a subset of.
  2. To extract only the portions of (a font) that are needed to display a particular document.

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