Cryptic crossword clue
Receptive earlier, after energy up slightly 8

The most common and most likely answer to this crossword clue is the 8 letter word PERVIOUS

I've seen this crossword clue in The Guardian
P
E
R
V
I
O
U
S

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The cryptic/wordplay part
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This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
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What does PERVIOUS mean?

PERVIOUS adjective
  1. Admitting passage; capable of being penetrated by another body or substance; permeable.
  2. Accepting of new ideas.
  3. Capable of being penetrated, or seen through, by physical or mental vision.
  4. Capable of penetrating or pervading.
  5. Open; perforate, as applied to the nostrils of birds

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