Credo (6)
I believe the answer is:
belief
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">credo</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for belief that I've seen before include "Trust, faith (6)" , "Firm conviction" , "Tenet, creed" , "Credo" , "Faith, credence" .)