The French maidens agree to go topless - start of double-page spread (5,4)
I believe the answer is:
lemon curd
'page spread' is the definition.
'lemon curd' can be an answer for 'spread'. I am unsure of the 'page' bit.
'the french maidens agree to go topless start of double' is the wordplay.
'the french' becomes 'le' (**).
'maidens' becomes 'm' (cricket abbreviation).
'agree' becomes 'concur' ('concur' can be a synonym of 'agree').
'to go topless' means to remove the first letter.
'start of' suggests taking the first letters.
The first letter of 'double' is 'd'.
'concur' with its first letter taken off is 'oncur'.
'le'+'m'+'oncur'+'d'='LEMON CURD'
(Other definitions for lemon curd that I've seen before include "Yellow stuff" , "Yellow goo" , "Thick yellow conserve" , "Thick, sweet spread" .)