Two lots of continental, very retro pastry (3-3)
I believe the answer is:
yum-yum
'continental very retro pastry' is the definition.
I know nothing about this answer so I cannot tell whether this works.
'two lots' is the wordplay.
'two' indicates the doubling of some letters.
'lots' becomes 'yum' (I can't explain this - if you can you should believe this answer much more).
'yum' duplicated is 'YUM-YUM'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for yum-yum that I've seen before include "A ward of Ko-Ko (The Mikado)" , "Repetitive exclamation of pleasure at eating" , "Expression of delight, especially of delicious food" , "Nanki-Poo's love; delicious!" , "Exclamation of pleasure at eating, from heroine of The Mikado" .)