Less pleasant (7)
I believe the answer is:
nastier
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">less pleasant</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 nastier that I've seen before include "more awkward" , "becomes more unpleasant" , "Less nice" , "Getting even worse" , "Retsina (anag) -- not so nice" .)