Informed of (4)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">informed of</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 aware that I've seen before include "well informed" , "Conscious, sentient" , "Having knowledge of, informed" , "Alert, conscious of" , "Acquainted with or mindful of" .)
(Other definitions for upon that I've seen before include "Straddling" , "voucher, business stopped" , "Onto" , "Carried - on top" , "Children's tales may begin ` `Once .... a time' '" .)