Cryptic crossword clue
Emotionally based movement unexpectedly inspires 50% more sex 13

The most common and most likely answer to this crossword clue is the 13 letter word EXPRESSIONISM

I've seen this crossword clue in Financial Times
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Buddy explains!

The straight part
We know that "Emotionally based movement" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case emotionally based movement = expressionism.
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 EXPRESSIONISM mean?

EXPRESSIONISM noun
  1. A movement in the arts in which the artist did not depict objective reality, but rather a subjective expression of their inner experiences
  2. A somewhat analogous genre in early 20th century music

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