Crossword Genius

Shallow and largely fake — bigly! (4)

Ross

I believe the answer is:

glib

'shallow' is the definition.
('glib' can be a synonym of 'shallow')

I cannot understand how the rest of the clue works.

(Other definitions for glib that I've seen before include "smooth" , "Superficially facile with words" , "slick in speech" , "Having only superficial plausibility" , "Bush" .)

I've seen this clue in The Guardian.
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