Open a French store (6)
I believe the answer is:
unpack
'open' is the definition.
(thesaurus)
'a french store' is the wordplay.
'a french' becomes 'un' ('a' in French).
'store' becomes 'pack' ().
'un'+'pack'='UNPACK'
(Other definitions for unpack that I've seen before include "Remove stuff from cases" , "Remove from the wrapping" , "Empty (a suitcase)" , "Remove (from case)" , "Empty a case" .)