"Science Guy" Bill (3)
I believe the answer is:
nye
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">science guy bill</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 nye that I've seen before include "Nickname of Aneurin Bevan" , "- - Bevan (politics)" , "Flock of pheasants" , "- - Bevan (NHS pioneer)" , "- - Bevan, 13 dn" .)