Harden by heat (6)
(Other definitions for anneal that I've seen before include "Harden by heating and cooling" , "toughening process" , "Treat (metal, glass) with heat" , "Toughen by heating and slow cooling" , "Make tough" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">harden by heat</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for bake that I've seen before include "Cook in oven (or sun?)" , "Cook (cakes, etc)" , "Oven-cook" , "Roast" , "work in kitchen?" .)