Twelvemonth (4)
I believe the answer is:
year
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">twelvemonth</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for year that I've seen before include "See 33 Across" , "1% of a century" , "12 months" , "See 9" , "26 fortnights" .)