Crossword Genius

Subsidiary building or an addition to a building (6)

Ross

I believe the answer is:

annexe

(Other definitions for annexe that I've seen before include "Supplementary part" , "Extra wing (on building)" , "Building joined to a larger one" , "Building attached to a largerone" , "Conservatory, e.g." .)

I've seen this clue in the Sydney Morning Herald.
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