The most common and most likely answer to this crossword clue is the 8 letter word WHOMEVER
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More clues leading to the result WHOMEVER
Buddy explains!
The straight part
We know that "No matter which person" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case no matter which person = whomever.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 WHOMEVER mean?
WHOMEVER pronoun- Whatever person or persons (as object of verb or preposition).