The symbol # (4)
(Other definitions for hash that I've seen before include "Dish of diced meat etc - cannabis (slang)" , "reheated meat and vegetables" , "Meat dish; mess, jumble" , "chop into small pieces" , "Recycled food" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">the symbol</span>' is the definition.<br/ ><span class="explanation-format__explanation">(ampersand is a kind of symbol)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ampersand that I've seen before include "Symbol for 'and'" , "Pens drama using &" , "Man spared (anag.)" , "Union character" , "Plus sign" .)