Play a guitar casually (5)
I believe the answer is:
strum
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">play a guitar casually</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 strum that I've seen before include "Sweep fingers over strings" , "Pluck the strings idly" , "Play idly on guitar etc" , "Plays guitar" , "Play badly on a guitar" .)