Not bogus (4)
(Other definitions for legit that I've seen before include "not unlawful" , "Right" , "In accordance with the law (abbr)" , "Run away - above board (colloq)" , "on the level" .)
'not bogus' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for real that I've seen before include "Genuine, not imitation" , "Actual, not illusory" , "True" , "Genuine or existing" , "Authentic" .)