English astronomer (5)
I believe the answer is:
hoyle
(Other definitions for hoyle that I've seen before include "English author, expert on card games, d.1769 - English astrophysicist, d. 2001" , "Edmond --, early writer on card games" , "Sir Fred --, astronomer" , "English writer on card games" , "Writer on games (according to -)" .)