The most common and most likely answer to this crossword clue is the 6 letter word COUSIN
I've seen this crossword clue in Independent
C
O
U
S
I
N
More clues leading to the result COUSIN
- Penny, say, hugging American relative
- Relative brings us into money
- Relative from America in the money?
- Sovereign, say, entertaining American relative
- Relative leaves home, having university to enter
- Piece about American person once removed?
- Half-Berber dish, trendy one in my family
- Openings in court could be envy of one with common ancestors
- Firm briefly employing 1 of 9
- Relative wants us to invest in currency
Buddy explains!

The straight part
We know that "person once removed?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case person once removed? = cousin.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 COUSIN mean?
COUSIN noun- The child of a person's uncle or aunt; a first cousin.
- Any relation who is not a direct ancestor or descendant but part of one's extended family; one more distantly related than an uncle, aunt, granduncle, grandaunt, nephew, niece, grandnephew, grandniece, etc.
- A title formerly given by a king to a nobleman, particularly to those of the council. In English writs, etc., issued by the crown, it signifies any earl.
- Something kindred or related to something else.
- (chiefly in the plural) A member of the British intelligence services (from an American perspective) or of the American intelligence services (from a British perspective).