The most common and most likely answer to this crossword clue is the 8 letter word PERVIOUS
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More clues leading to the result PERVIOUS
Buddy explains!

The straight part
We know that "Open-minded" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case open-minded = pervious.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 PERVIOUS mean?
PERVIOUS adjective- Admitting passage; capable of being penetrated by another body or substance; permeable.
- Accepting of new ideas.
- Capable of being penetrated, or seen through, by physical or mental vision.
- Capable of penetrating or pervading.
- Open; perforate, as applied to the nostrils of birds