Mails (5)
I believe the answer is:
posts
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">mails</span>' is the definition.<br/ ><span class="explanation-format__explanation">('post' can be a synonym of 'mail')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for posts that I've seen before include "a couple seen propping up the bar?" , "Mails the uprights?" , "Sends by mail" , "Stakes" , "Is dispatching" .)