Answer: maclean

AnswerCrossword Clue
MACLEANSpy novelist Alistair
MACLEANAuthor Alistair
MACLEANOne-time owner of Hope diamond.
MACLEANAuthor of "H. M. S. Ulysses."
MACLEANAlistair who wrote "Ice Station Zebra"
MACLEANNorman who wrote "A River Runs Through It"