Spikes (4)
I believe the answer is:
ears
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">spikes</span>' is the definition.<br/ ><span class="explanation-format__explanation">('ear' can be a synonym of 'spike')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ears that I've seen before include "Seed-bearing parts of corn" , "Heads of corn" , "Auditors" , "Locations for buds or studs?" , "'''Friends, Romans, countrymen, lend me your ...'' (Julius Caesar) (4)'" .)