A glib fellow, before getting rich (8)
I believe the answer is:
affluent
'rich' is the definition.
(similar in meaning)
'a glib fellow before' is the wordplay.
'glib' becomes 'fluent' (I can't justify this - if you can you should give a lot more credence to this answer).
'fellow' becomes 'f' (abbreviation - of a society etc.).
'before' says to put letters next to each other.
'fluent' put after 'f' is 'ffluent'.
'a'+'ffluent'='AFFLUENT'
'getting' acts as a link.
Can you help me to learn more?
(Other definitions for affluent that I've seen before include "Well-heeled" , "Very well off, quite rich" , "comfortable" , "Wealthy - abundant" , "Well-off" .)