"Fine by me" (4)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fine by me</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for okay that I've seen before include "Permissible; fairly good" , "Not terrific but acceptable" , "Common jargon for yes, all right" , "Give approval to" , "Leave" .)
(Other definitions for sobeit that I've seen before include "Amen, in full" , "Very well, let's have it thus" , "Amen means . . . . . ." , "Very well, let it happen" , "provided" .)