Cryptic crossword clue
It could be put into stash of ideas 10

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

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

CONCEPTUAL adjective
  1. Of, or relating to concepts or mental conception; existing in the imagination.
  2. Of or relating to conceptualism.

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