The most common and most likely answer to this crossword clue is the 14 letter word INTERPOLATIONS
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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 INTERPOLATIONS mean?
INTERPOLATIONS noun- An abrupt change in elements, with continuation of the first idea.
- The process of estimating the value of a function at a point from its values at nearby points.
- The process of including and processing externally-fetched data in a document or program; see interpolate.
- That which is introduced or inserted, especially something foreign or spurious.