This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
閍 combines 門 (gate) with 方, but the exact historical development and original meaning are uncertain.
Since no clear meaning is known, picture a mysterious gate 門 with a square 方 inside, like a secret room whose purpose is unknown.
For ホウ, imagine a gate 門 with a square 方 inside, and a guard shouting 'HOLD!' (ホウ) to stop you from entering the mysterious room.