Not fully formed (8)
I believe the answer is:
inchoate
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">not fully formed</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for inchoate that I've seen before include "Confused" , "Action he took having just begun" , "just beginning" , "Just begun, not yet fully developed" , "Undeveloped" .)