Part of B.A. (4)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">part of ba</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 arts that I've seen before include "Eg, painting, sculpture" , "Star over aesthetic endeavours" , "Anagram of 19" , "Humanities" , "Wiles, skills" .)