Bellows (5)
I believe the answer is:
roars
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">bellows</span>' is the definition.<br/ ><span class="explanation-format__explanation">('roar' can be a synonym of 'bellow')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for roars that I've seen before include "Calls like lion" , "Sounds like a lion" , "Bellows like a bull" , "'Deep, bellowing bursts of sound (5)'" , "Deep bellows" .)