Very close-fitting (4)
(Other definitions for snug that I've seen before include "Comfortable -- small secluded room" , "Well protected or concealed" , "Bar-parlour" , "Close fitting but comfortable" , "joiner" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">very close-fitting</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>