Castle tower (7)
(Other definitions for bastion that I've seen before include "Obtains in fortified place or stronghold" , "fortress" , "Obtains (anag.)" , "part of stronghold" , "Projecting part of a fortification" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">castle tower</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for turret that I've seen before include "Small corner tower" , "Little (e.g. castle) tower" , "Keep feature" , "Small tower on defensive wall - or tank" , "Small tower on building or tank" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">castle tower</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 keep that I've seen before include "Board and lodgings, perhaps" , "Retain or care for" , "Main tower of a medieval castle" , "Retain, maintain" , "Save" .)