Covered Walkway Around a Courtyard
Puzzle 19 of Alliteration Piece of Cake Pack
Question is: Covered Walkway Around a Courtyard
and the answer is: CLOISTER
Word Meaning:
CLOISTER — A covered walk with an open colonnade on one side, running along the walls of buildings that surround a quadrangle; especially:
Definitions from Wiktionary.