Answer:

GUS

Answer	Crossword Clue
GUS	"Ain't We Got Fun" lyricist Kahn
GUS	Indiana's lost astronaut, familiarly
GUS	Astronaut Grissom

GUS	Character in "Breaking Bad" or "Psych" (neither was particularly gloomy, though)
GUS	Kingpin Fring on "Breaking Bad"
GUS	Grissom of NASA
GUS	NASA's Grissom
GUS	Broadway composer Kahn
GUS	Grissom of the Mercury Seven
GUS	Gloomy guy?
GUS	Gloomy fellow

GUS	Poker star Hansen
GUS	"Cats" character called "the Theatre Cat"
GUS	Gloomy guy
GUS	"Milk" director Van Sant
GUS	Mercury Seven astronaut Grissom
GUS	"To Die For" director Van Sant
GUS	"Yes Sir, That's My Baby" composer Kahn
GUS	Quarterback Frerotte

GUS	Gloomy one
GUS	"Ain't We Got Fun?" lyricist Kahn
GUS	"Gloomy" guy
GUS	Professional poker player Hansen
GUS	Director Van Sant
GUS	"Milk" director ... Van Sant
GUS	"Gloomy ...."
GUS	1998 "Psycho" director Van Sant

GUS	Gloomy ...
GUS	Gloomy chap?
GUS	"Good Will Hunting" director Van Sant
GUS	.. Fring, "Breaking Bad" drug kingpin
GUS	The Theatre Cat in "Cats"
GUS	Gloomy fellow?
GUS	Gloomy .. (grump)
GUS	Gloomy ..

GUS	Lyricist Kahn
GUS	Gloomy .. (glum one)
GUS	Filmmaker Van Sant
GUS	Project Mercury nickname
GUS	Revered cat in "Cats"