Lady bears son, moving about (8)
I believe the answer is:
baroness
'lady' is the definition.
(baroness is a kind of lady)
'bears son moving about' is the wordplay.
'moving about' indicates an anagram.
'bears'+'son'='bearsson'
'bearsson' is an anagram of 'BARONESS'.
(Other definitions for baroness that I've seen before include "Thatcher possibly" , "Noblewoman" , "Peer's title" , "Woman life-peer" , "Titled lady" .)