Slangy affirmative (4)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">slangy affirmative</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 yeah that I've seen before include "Definitely (informal)" , "Yes (informally)" , "'She loves you, ..., ..., ...' (song)" , "positive response?" , "Exclamation of agreement (or doubt!)" .)
(Other definitions for sure that I've seen before include "Definite" , "The old sewer" , "of course" , "stable" , "Convinced" .)