Totally engrossed (4)
I believe the answer is:
rapt
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">totally engrossed</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 rapt that I've seen before include "riveted" , "Engrossed, spellbound" , "Taken up entirely" , "Absorbed and enchanted" , "'Transported, entranced (4)'" .)