Memorable (13)
There are a few possibilities for this:
unforgettable
(Other definitions for unforgettable that I've seen before include "stuck in my brain?" , "Nat King Cole's memorable song?" , "Striking" , "Noteworthy" , "Highly memorable" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">memorable</span>' is the definition.<br/ ><span class="explanation-format__explanation">(something catchy is easy to remember)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for catchy that I've seen before include "Tuneful and easily remembered" , "Musically memorable" , "Type of tune that stays in the memory" , "(Of tune) infectious" , "Hummable" .)