Annexe (4-2)
(Other definitions for lean-to that I've seen before include "Shed, outbuilding" , "Attached outbuilding" , "Building with roof resting against larger building (4, 2)" , "Small building resting on side of larger one" , "Penthouse" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">annexe</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for extension that I've seen before include "Annexe" , "Added part" , "Office phone, perhaps" , "supplement" , "new part of home?" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">annexe</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for wing that I've seen before include "Stage area out of sight of the audience" , "Pinion" , "Organ of flight" , "Aircraft lift provider" , "Flank; move quickly" .)
(Other definitions for leanto that I've seen before include "Roof" , "shed" .)