Unappreciative person (7)
I believe the answer is:
ingrate
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">unappreciative person</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ingrate that I've seen before include "Tangier (anag)" , "without a word of thanks?" , "I'm not appreciative" , "One who never says thanks" , "Thankless wretch" .)