Familiar with being roughly ousted (4,2)
I believe the answer is:
used to
'familiar with' is the definition.
(I've seen this before)
'roughly ousted' is the wordplay.
'roughly' is an anagram indicator.
'ousted' with letters rearranged gives 'USED TO'.
'being' acts as a link.
(Other definitions for used to that I've seen before include "Not unfamiliar with" , "Accustomed or inured" , "Familiar with" , "Did at times in the past" , "Was in the habit" .)