Grumbler (8)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">grumbler</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 sourpuss that I've seen before include "Miserable so-and-so" , "Habitually sullen person" , "crab" , "Habitually gloomy person" , "One has a habitually sullen expression" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">grumbler</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that grumbler can be written as moaner)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for moaner that I've seen before include "Grouch" , "Complainer" , "Grumbler" , "One who complains" .)