Crossword Puzzle Clan intermarriage preventer

Clue: Clan intermarriage preventer

Not clandestine (OPEN with 4 letters)
Clan's gathering place, perhaps (FAMILYROOM with 10 letters)
With "The," Tom Clancy novel, after a pregnant pause? (HUNTFORREDJULY with 14 letters)
One of the clan (NIECE with 5 letters)
Org. in Tom Clancy novels (CIA with 3 letters)
A Clanton at the O.K. Corral (IKE with 3 letters)
Clan clash (FEUD with 4 letters)
Scottish clan chief (THANE with 5 letters)
Clangor (e.g. BLARE with 5 letters)
''The Clan of the Cave Bear'' novelist Jean M. (AUEL with 4 letters)