Memorizes (6)
I believe the answer is:
learns
'memorizes' is the definition.
('learn' can be a synonym of 'memorize')
This is all the clue.
(Other definitions for learns that I've seen before include "Teaches non-standard" , "Acquires knowledge as in class" , "Imbibes knowledge" , "Gains knowledge or skill" , "Gains knowledge or skills" .)