Possible Clues:

• 15-Across whose middle initials were H.W
• Early '90s pres., familiarly
• George the first?
• W.'s father
• U.S. pres. George (#41 as opposed to #43)
• Pres. before Clinton
• '41'
• CIA director under Ford
• '70s CIA director
• 1970s CIA director, familiarly