Lady in pub with my posh son? (8)
I believe the answer is:
baroness
'lady' is the definition.
(I know that baroness is a type of lady)
'pub with my posh son?' is the wordplay.
'pub' becomes 'bar' (both are drinking establishments).
'with' means one lot of letters go next to another.
'my' becomes 'one's' ('one's' is a humorous equivalent to 'my').
'posh son?' becomes 's' (genealogical abbreviation for son. I am not sure about the 'posh' bit.).
'bar'+'ones'+'s'='BARONESS'
'in' is the link.
Can you help me to learn more?
(Other definitions for baroness that I've seen before include "Titled lady" , "Peer's title" , "Thatcher possibly" , "Lady peer" , "Lady Thatcher?" .)