Have ambitions (6)
I believe the answer is:
aspire
'have ambitions' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for aspire that I've seen before include "Have a strong desire to reach an objective" , "Seek (to do something)" , "I spare (anag.)" , "Have lofty aims" , "Aim (for higher things)" .)