Get to know again (7)
I believe the answer is:
relearn
'get to know again' is the definition.
('learn' can be a synonym for 'get to know' so perhaps 'relearn' is OK for 'get to know again')
This is the entire clue.
(Other definitions for relearn that I've seen before include "Mug up once more" , "Acquire knowledge again, having forgotten it" , "Once again master" , "Come to know something again" , "Become aware of again" .)