Thankless wretch (7)
I believe the answer is:
ingrate
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">thankless wretch</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for ingrate that I've seen before include "Granite (anag.)" , "Ungrateful person" , "one showing no appreciation" , "Thankless sort" , "Unappreciative character" .)