Lake and river rose catastrophically (9)
I believe the answer is:
reservoir
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">lake</span>' is the definition.<br/ ><span class="explanation-format__explanation">(reservoir is a kind of lake)</span><br/ ><br/ >'<span class="explanation-format__original">river rose catastrophically</span>' is the wordplay.<br/ >'<span class="explanation-format__original">catastrophically</span>' is an anagram indicator.<br/ >'<span class="explanation-format__original">river</span>'+'<span class="explanation-format__original">rose</span>'='<span class="explanation-format__intermediate">riverrose</span>'<br/ >'<span class="explanation-format__intermediate">riverrose</span>' is an anagram of '<span class="explanation-format__answer">RESERVOIR</span>'.<br/ ><br/ >'<span class="explanation-format__original">and</span>' acts as a link.<br/ ></span>
(Other definitions for reservoir that I've seen before include "Store for water etc" , "Man-made lake of stored water" , "water over a wide area?" , "Area for storage, of water say" , "River rose (anag.)" .)