Girl from London in Andover (4)
I believe the answer is:
nina
'girl' is the definition.
'from london in andover' is the wordplay.
'from' indicates the answer is hidden within the clue.
'NINA' can be found hidden inside 'london in andover'.
(Other definitions for nina that I've seen before include "One of Columbus's ships in 1492; girl's name" , "Al Hirschfeld's 'hidden' daughter" , "Girl" , "- Simone, US singer" , "hidden crossword message" .)