Cloisters of church outside a London complex (9)
I believe the answer is:
colonnade
'cloisters of' is the definition.
The definition suggests a singular noun which matches the answer.
'church outside a london complex' is the wordplay.
'church' becomes 'ce' (abbreviation for Church of England).
'outside' means one lot of letters goes inside another.
'complex' indicates anagramming the letters.
'a'+'london'='alondon'
'alondon' anagrammed gives 'olonnad'.
'ce' going around 'olonnad' is 'COLONNADE'.
Can you help me to learn more?
(Other definitions for colonnade that I've seen before include "supporters in a row" , "Row of columns supporting a roof" , "Arcade" , "Collection of columns" , "Row of evenly spaced pillars" .)