Crossword Genius

Extension to a building (6)

Ross

I believe the answer is:

annexe

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

(Other definitions for annexe that I've seen before include "Extra wing (on building)" , "Building joined to a larger one" , "Additional building" , "Additional room etc for house" , "Extension to main building" .)

I've seen this clue in the Evening Standard.
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