Titled lady one's seen in watering holes (8)
I believe the answer is:
baroness
'titled lady' is the definition.
(I've seen this before)
'one's seen in watering holes' is the wordplay.
'seen in' means one lot of letters goes inside another.
'watering holes' becomes 'bars'.
'ones' going within 'bars' is 'BARONESS'.
(Other definitions for baroness that I've seen before include "Woman life-peer" , "Thatcher possibly" , "Noblewoman" , "Aristocrat" , "Titled lady" .)