The most common and most likely answer to this crossword clue is the 6 letter word RATIOS
I've seen this crossword clue in Independent
R
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More clues leading to the result RATIOS
Buddy explains!

The straight part
We know that "Legal reasons" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case legal reasons = ratios.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 RATIOS mean?
RATIOS noun- A number representing a comparison between two named things.
- The relative magnitudes of two quantities (usually expressed as a quotient).
- Short for ratio decidendi.
- The amount of comments to a post or other expression on social media relative to the number of likes.