Third month (5)
I believe the answer is:
march
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">third month</span>' is the definition.<br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for march that I've seen before include "that happens fairly early each year" , "Month - advance in step" , "Parade" , "Proceed in procession" , "Military walk; month" .)