Have memorized (4)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
know
'have memorized' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for know that I've seen before include "A Channel port, type of sole" , "Have information" , "Ken" , "Articulated" , "Be aware of (something)" .)