Bridge (4)
I believe the answer is:
span
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">bridge</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for span that I've seen before include "Complete duration" , "Full extent end to end" , "Ox team; bridge" , "Interval in terms of time" , "Interval; pair of yoked oxen" .)