Barrier to entry 4 letters

Crossword clues for Barrier to entry 4 letters

Answer	Clue
EXAM	Entry barrier?
DOOR	Barrier to entry
MOAT	Barrier to entry?
MOAT	Certain barrier to entry
IRONGATE	Prison entry barrier
ALARMSYSTEM	Barrier to entry
STEELDOORS	Hefty barriers to entry
REEFS	Some barriers to entry in the shipping business?
STILE	A barrier to entry