Like an earworm (6)
I believe the answer is:
catchy
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">like an earworm</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for catchy that I've seen before include "Attention-grabbing" , "Easy to remember and sing" , "(Of a tune) instantly appealing and memorable" , "Staying in the mind of a tune" , "Tuneful and easily remembered" .)