Hard igneous rock (7)
I believe the answer is:
granite
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hard igneous rock</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 granite that I've seen before include "Tangier (anag.)" , "Hard stone from Tangier" , "Hard granular rock" , "Hard igneous rock" , "Showing great resolution" .)