Crossword Genius

Supplementary building (6)

Ross

I believe the answer is:

annexe

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">supplementary building</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(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 Evening Standard and The Guardian.
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