Cryptic crossword clue
Significant old papers I have 10

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

I've seen this crossword clue in The Daily Telegraph
E
X
P
R
E
S
S
I
V
E

Buddy explains!

The straight part
We know that "Significant" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case significant = expressive.
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 EXPRESSIVE mean?

EXPRESSIVE noun
  1. Any word or phrase that expresses (that the speaker, writer, or signer has) a certain attitude toward or information about the referent.
  2. (more narrowly) A word or phrase, belonging to a distinct word class or having distinct morphosyntactic properties, with semantic symbolism (for example, an onomatopoeia), variously considered either a synonym, a hypernym or a hyponym of ideophone.
EXPRESSIVE adjective
  1. Effectively conveying thought or feeling.

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