Cryptic crossword clue
The speaker’s standing on section of facade or barrier 10

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

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

The straight part
We know that "barrier" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case barrier = impediment.
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 IMPEDIMENT mean?

IMPEDIMENT noun
  1. A hindrance; that which impedes or obstructs progress.
  2. A disability, especially one affecting the hearing or speech.
  3. (chiefly in the plural) Baggage, especially that of an army; impedimenta.

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