Large wave (7)
(Other definitions for tsunami that I've seen before include "Marine natural disaster" , ""Harbour wave"" , "Large tidal wave" , "I am nuts! (anag)" , "wall of water" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">large wave</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 breaker that I've seen before include "White-topped wave" , "from rider disciplining horse?" , "Wave hitting the shore" , "Heavy wave arriving on the shore" , "A large wave, sounds destructive" .)