Cryptic crossword clue
Elastic persisting, most flexible 10

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

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

The straight part
We know that "most flexible" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case most flexible = springiest.
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

SPRINGIEST adjective
  1. That returns rapidly to its original form (as a spring does) after being bent, compressed, stretched, etc.
  2. Lively; bouncy.
  3. Characteristic of the spring season.

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