Advertising phrase (6)
I believe the answer is:
slogan
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">advertising phrase</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 slogan that I've seen before include "Tag line" , "Short catchy phrase used in advertising" , "War cry - advertising jingle" , "Shibboleth" , "Marketing phrase" .)