The most common and most likely answer to this crossword clue is the 6 letter word AGNATE
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More clues leading to the result AGNATE
Buddy explains!

The straight part
We know that "paternal relative" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case paternal relative = agnate.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 AGNATE mean?
AGNATE noun- A relative whose relation is traced only through male members of the family.
- Any paternal male relative.
- Related to someone by male connections or on the paternal side of the family.
- Allied; akin
- Having a similar semantic meaning.