Vulgar type secures the bar, having offloaded one religious building (9)
I believe the answer is:
cathedral
'religious building' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for cathedral that I've seen before include "seat of power" , "religious site" , "Large, important church" , "religious building" , "Main church of diocese" .)