3: One working with Linux, e.g.
8: One rotation of the earth
11: Marginally sufficient
20: Pioneering video game
21: Bread pieces, to fondue
24: Amontillado container, for Poe
25: Starring vehicle for Sigourney Weaver
26: Substantive, like a solid or liquid
27: Scratching post users
39: Raymond of 'Perry Mason'
42: Ancient Roman gathering place
48: Kind of ant or brigade