Cryptic crossword clue
Clear kind of flask stowed inside, as far down as possible 10

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

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

The straight part
We know that "as far down as possible" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case as far down as possible = nethermost.
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 NETHERMOST mean?

NETHERMOST adjective
  1. Farthest down; lowest.

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