Dispiriting experience (6)
I believe the answer is:
downer
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">dispiriting experience</span>' is the definition.<br/ ><span class="explanation-format__explanation">(a depressing situation or person)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for downer that I've seen before include "Saddening experience" , "A sad thing" , "Depressing experience" , "Informally a depressant drug" , "Sedative" .)