Shop user (8)
I believe the answer is:
customer
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">shop user</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 customer that I've seen before include "Regular" , "The person who pays" , "Someone who pays for goods or services" , "Person shopping" , "Person buying" .)