Mother takes girl back to a Spanish resort (6)
I believe the answer is:
malaga
'spanish resort' is the definition.
(I've seen this before)
'mother takes girl back to a' is the wordplay.
'mother' becomes 'ma' (ma is a kind of mother).
'takes' says to put letters next to each other.
'girl' becomes 'gal' ('gal' can be a synonym of 'girl'**).
'back' is a reversal indicator.
'to' is a charade indicator (letters next to each other).
'gal' written backwards gives 'lag'.
'ma'+'lag'+'a'='MALAGA'
(Other definitions for malaga that I've seen before include "Spanish port and resort town" , "Costa del Sol resort" , "City of Andalusia" , "Sweet wine; Spanish port" , "Southern Spanish city and resort" .)