Answer:

INTER

Answer	Crossword Clue
INTER	Action or change intro
INTER	Com or face lead-in
INTER	... alia

INTER	Prefix meaning "reciprocal"
INTER	.. alia
INTER	Put under
INTER	Lay to rest
INTER	Bury
INTER	Work as an undertaker
INTER	Encrypt?
INTER	Prefix with com or change

INTER	Lock opener?
INTER	Prefix with face or faith
INTER	Prefix with act or play
INTER	Prefix with marry and mingle
INTER	Changeable opener?
INTER	Entomb
INTER	Prefix with national
INTER	Put in a mausoleum

INTER	Act opener?
INTER	Put to rest?
INTER	Loper leader
INTER	Prefix meaning "between"
INTER	Put in a sepulcher
INTER	Place in the earth
INTER	Prefix with net or national
INTER	Part of ICBM

INTER	Prefix with personal or planetary
INTER	ICBM part
INTER	Leave or lock leader
INTER	Prefix with state or relate
INTER	Prefix with weave or leave
INTER	Head of state?
INTER	Put to rest
INTER	Cover with earth

INTER	Beginning to change?
INTER	Prefix with leave or weave
INTER	Prefix with change or state
INTER	Prefix with change or com
INTER	Lock or link lead-in