Crossword Genius

Church walls in Barcelona perhaps quartz (8)

Ross

I believe the answer is:

basilica

'church' is the definition.
(I know that basilica is a type of church)

'walls in barcelona perhaps quartz' is the wordplay.
'walls in' suggests removing the centre.
'perhaps quartz' becomes 'silica' (quartz is a type of silica).
'barcelona' with its centre taken out is 'ba'.
'ba'+'silica'='BASILICA'

(Other definitions for basilica that I've seen before include "Important Roman Catholic church" , "Roman building used for public administration" , "Magnificent church" , "Church edifice" , "A large Christian church with two rows of columns (8)" .)

I've seen this clue in The Guardian.
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