Have ambition (6)
I believe the answer is:
aspire
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">have ambition</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 aspire that I've seen before include "Yearn, dream (towards)" , "Have ambitions (to achieve something)" , "Have an ambitious plan or a lofty goal" , "Have a strong desire to achieve something" , "Set your sights on" .)