Come to light, become known (9)
I believe the answer is:
transpire
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">come to light</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >'<span class="explanation-format__original">become known</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ ></span>
(Other definitions for transpire that I've seen before include "Prove to be so, happen" , "give off water vapour" , "Become known about terrapins" , "Lose water vapour" , "revealed" .)