Lady one's seen in pubs (8)
I believe the answer is:
baroness
'lady' is the definition.
(I've seen this before)
'one's seen in pubs' is the wordplay.
'seen in' is an insertion indicator.
'pubs' becomes 'bars' (I've seen this in other clues).
'ones' going within 'bars' is 'BARONESS'.
(Other definitions for baroness that I've seen before include "Noble" , "Lady Thatcher?" , "Peer's title" , "Female life peer" , "Lady peer" .)