Show preference for the French savoury products (7)
I believe the answer is:
pickles
'savoury products' is the definition.
Although both the answer and definition are plural nouns, I cannot see how one could define the other.
'show preference for the french' is the wordplay.
'show preference' becomes 'pick' (I can't justify this - if you can you should give a lot more credence to this answer).
'for' is a charade indicator (letters next to each other).
'the french' becomes 'les' (plural form of 'the' in French).
'pick'+'les'='PICKLES'
Can you help me to learn more?
(Other definitions for pickles that I've seen before include "Vegetables preserved in vinegar or brine" , "Preserves in vinegar or brine" .)