Answer:

fess

Answer	Crossword Clue
FESS	Actor Parker
FESS	Parker who played Boone
FESS	Come clean, with "up"

FESS	"Daniel Boone" star Parker
FESS	Own (up)
FESS	Admit, with "up"
FESS	Spill, with "up"
FESS	Concede, with "up"
FESS	Parker who played Daniel Boone
FESS	Not conceal, with "up"
FESS	... up (come clean)

FESS	Parker who played Crockett
FESS	... up (admit)
FESS	Parker of old TV
FESS	Parker of "Daniel Boone"
FESS	Spill the info, with "up"
FESS	Portrayer of Daniel and Davy
FESS	He played Davy and Dan'l
FESS	Stop lying, with "up"

FESS	Admit to wrongdoing, with "up"
FESS	Parker who played
FESS	...- up: spill the beans
FESS	Parker who played Davy Crockett
FESS	Cop to the crime, with "up"
FESS	Crockett portrayer Parker
FESS	.. up (come clean)
FESS	Admit all, with "up"

FESS	Tell it, with "up"
FESS	.. up (admit the truth)
FESS	Admit everything, with "up"
FESS	Admit it all, with "up"
FESS	Spill something, with "up"
FESS	... up (admit guilt)
FESS	Admit guilt, with "up"
FESS	Admit: Colloq.

FESS	Band across an escutcheon.
FESS	Escutcheon band.
FESS	Heraldic band.
FESS	First name of screen's Davy Crockett.
FESS	Actor Parker.