Fourth month (5)
I believe the answer is:
april
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fourth month</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for april that I've seen before include "''... is the cruellest month'' (TS Eliot)" , "Month that's autumnal in Oz" , "March is followed by this" , "4th month" , "Start of the financial year" .)