Behaves (4)
I believe the answer is:
acts
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">behaves</span>' is the definition.<br/ ><span class="explanation-format__explanation">(acting is a kind of behaving)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for acts that I've seen before include "Performs on stage" , "Parliaments pass them" , "functions" , "Deeds; NT book" , "book form" .)