Crossword puzzle clue "held a position"

Position held by the supervisor of a river tributary?

Retreat from a previously held position

Position held by Dirk Kempthorne before becoming George W. Bush's final interior secretary

Position held three times by Henry Clay

Held a position

2005-08 position held by Barack Obama: Abbr.

Secretary of War Alphonso whose son later held the position

Pole position or pool position