The most common and most likely answer to this crossword clue is the 8 letter word FAIRNESS
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Buddy explains!

The straight part
We know that "equity" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case equity = fairness.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 FAIRNESS mean?
FAIRNESS noun- The property of being fair or equitable.
- The property of being fair or beautiful.