Gather into wrinkles (6)
I believe the answer is:
pucker
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">gather into wrinkles</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>
(Other definitions for pucker that I've seen before include "Gather into wrinkles, cause lips to bulge" , "Gather into bulge, say lips" , "Form into wrinkles" , "Gather skin into folds" , "Purse lips, or gather into wrinkles" .)