The most common and most likely answer to this crossword clue is the 9 letter word TRIBESMAN
I've seen this crossword clue in The Times
T
R
I
B
E
S
M
A
N
More clues leading to the result TRIBESMAN
- Large family member goes to welcome British crew
- Native attempts to trap British on island
- Society member hears about bishop and valet
- Clan member with damaged brain stem
- TB remains problematic for member of ethnic group
- Family member's tense with angry bridesman dismissing daughter
- Trim beans, cracking up clan member
- Member of society merits ban, possibly
Buddy explains!

The straight part
We know that "Large family member" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case large family member = tribesman.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 TRIBESMAN mean?
TRIBESMAN noun- A (usually male) member of a tribe.