Of impressive proportions (4)
I believe the answer is:
epic
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">of impressive proportions</span>' is the definition.<br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for epic that I've seen before include "Tale of heroic deeds" , "Surpassing the ordinary" , "Long literary work about great events" , "Confirm the truth of" , "blockbuster" .)