Tart-tasting (6)
I believe the answer is:
acidic
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">tart</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">tasting</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I have seen 'Sharp tasting' mean 'acidic' so perhaps 'tasting' could also mean 'acidic')</span><br/ ><br/ ></span>
(Other definitions for acidic that I've seen before include "Like vinegar" , "Sarcastic or sour" , "Tart, sour" , "Tasting sharp or sour" , "Sour; bitter" .)