Answer: deepthroat

AnswerCrossword Clue
DEEPTHROAT

Woodward's anonymous informant

DEEPTHROAT

Informant some say was Pat Buchanan

DEEPTHROAT

Watergate figure whose real name is Mark Felt

DEEPTHROAT
Watergate figure
DEEPTHROAT
Famed Watergate tipster
DEEPTHROAT"All the President's Men" figure
DEEPTHROATSource for Woodward