Became known (7)
'became known' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for emerged that I've seen before include "Came into view or became apparent" , "Came forth" , "Emanated" , "Deem Reg to have come out" , "Came out, became known" .)
'became known' is the definition.
('get out' can be a synonym of 'become known')
This is the entire clue.