Head part (3)
I believe the answer is:
ear
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">head part</span>' is the definition.<br/ ><span class="explanation-format__explanation">('ear' is part of 'head')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ear that I've seen before include "Lend one and listen" , "Hammer in this" , "willingness to listen" , "Spike (wheat)" , "Organ of hearing" .)