River of Shakespeare's Stratford
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">river of shakespeare's stratford</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for avon that I've seen before include "River flowing through Bristol to the Severn" , "Bristol's river" , "English river, flows through Stratford" , "English river name in multiple use" , "Bath's river" .)