Came to understand (8)
I believe the answer is:
realised
'came to understand' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for realised that I've seen before include "Came to understand" , "made ready" , "Achieved; red aisle (anag.)" , "Understood - cashed in" , "Came to be aware" .)