Many a TikTok user (4)
I believe the answer is:
teen
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">many a tiktok user</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 teen that I've seen before include "Of 13 to 19 year olds" , "Juvenile" , "Youngster of a certain age" , "Adolescent (informal)" , "Youngster over twelve" .)