Optimist's feeling (4)
I believe the answer is:
hope
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">optimist's feeling</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for hope that I've seen before include "writer" , "It goes with faith and charity" , "Aspiration" , "Bob --, US comic" , "English-born US comedian, d. 2003" .)