Her mother turned up with Charles Lamb (6)
I believe the answer is:
amelia
'her' is the definition.
'mother turned up with charles lamb' is the wordplay.
'mother' becomes 'ma' (ma is a kind of mother).
'turned up' is a reversal indicator.
'with' says to put letters next to each other.
'charles lamb' becomes 'elia' (I've seen this before).
'ma' reversed gives 'am'.
'am'+'elia'='AMELIA'
(Other definitions for amelia that I've seen before include "I, a male (anag) - a woman" , "Legless condition" , "famous pilot" , "-- Earhart, US aviation pioneer" , "Fielding novel" .)