Cryptic crossword clue
Test Rubicon somehow presents 11

The most common and most likely answer to this crossword clue is the 11 letter word CONTRIBUTES

I've seen this crossword clue in The Daily Telegraph
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More clues leading to the result CONTRIBUTES

Buddy explains!

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

CONTRIBUTES verb
  1. To give something that is or becomes part of a larger whole.

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