Block up (8)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">block up</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 obstruct that I've seen before include "Block, hinder" , "Prevent or hinder movement" , "Stymie" , "Hinder or impede" , "Stop" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">block up</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 dam that I've seen before include "Mad as an animal mum" , "A mad animal mother" , "Water barrier, quite mad" , "Reservoir barrier" , "Female parent of an animal, especially livestock" .)