Crowdsourced review site (4)
I believe the answer is:
yelp
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">crowdsourced review site</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for yelp that I've seen before include "Bark like a puppy" , "(Eg, dog's) short cry of alarm" , "old boast" , "bark sharply" , "Short sharp cry (of such as a dog)" .)