Welsh festival (10)
I believe the answer is:
eisteddfod
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">welsh festival</span>' is the definition.<br/ ><span class="explanation-format__explanation">(Welsh cultural festival)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for eisteddfod that I've seen before include "Welsh art festival" , "Celtic festival" , "arts competition" , "Welsh festival of music and poetry" , "Welsh arts festival" .)