Crossword Genius

Supplementary building (6)

Ross

I believe the answer is:

annexe

'supplementary building' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for annexe that I've seen before include "Extra piece of building" , "Addition that extends a main building" , "An addition to a document or building" , "outbuilding" , "Supplementary attached building" .)

I've seen this clue in The Telegraph, the Irish Times (Simplex), The Guardian and the Evening Standard.
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