Adult males (3)
I believe the answer is:
men
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">adult males</span>' is the definition.<br/ ><span class="explanation-format__explanation">('man' can be a synonym of 'adult male')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for men that I've seen before include "Male humans" , "gents" , "Human males" , "Males of Armenian extraction." , "Fellows, chaps" .)