Relishes choice by the French (7)
I believe the answer is:
pickles
'relishes' is the definition.
(pickle is a kind of relish)
'choice by the french' is the wordplay.
'choice' becomes 'pick' ('pick' can be a synonym of 'choice').
'by' means one lot of letters go next to another.
'the french' becomes 'les' (les is the in french).
'pick'+'les'='PICKLES'
(Other definitions for pickles that I've seen before include "Vegetables preserved in vinegar or brine" , "Preserves in vinegar or brine" .)