Most pleasant (6)
I believe the answer is:
nicest
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">most pleasant</span>' is the definition.<br/ ><span class="explanation-format__explanation">('nice' is associated in meaning with 'pleasant')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for nicest that I've seen before include "Sin etc (anag)" , "I scent in the most pleasant way" , "Most agreeable" , "Most acceptable" , "most appetising" .)