Typical beginning (5)
I believe the answer is:
proto
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">typical beginning</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 proto that I've seen before include "Prefix indicating the first, earliest or original" , "Denotes the first or earliest" .)