Likely to become successful (2-3-6)
I believe the answer is:
up-and-coming
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">likely to become successful</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 up-and-coming that I've seen before include "Likely to become successful" , "Rapidly becoming successful" , "Promising to be successful" , "Beginning to become successful" .)