Cryptic crossword clue
Flexible thought process is adding something 15

The most common and most likely answer to this crossword clue is the 15 letter word SUPPLEMENTATION

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

The straight part
We know that "adding something" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case adding something = supplementation.
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 SUPPLEMENTATION mean?

SUPPLEMENTATION noun
  1. The act of supplementing
  2. Something added as a supplement

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