Covered passages in a sacred building (7)
I believe the answer is:
arcades
'covered passages' is the definition.
(I've seen this before)
'a sacred building' is the wordplay.
'building' is an anagram indicator.
'sacred' is an anagram of 'rcades'.
'a'+'rcades'='ARCADES'
'in' is the link.
(Other definitions for arcades that I've seen before include "Arched walks" , "Covered passageway with shops and stalls" , "Covered areas with shops" , "Covered passages with shops and stalls" , "More than one mall" .)