Find a French soil (7)
I believe the answer is:
unearth
'find' is the definition.
(unearthing is a kind of finding)
'a french soil' is the wordplay.
'a french' becomes 'un' ('a' in French).
'soil' becomes 'earth' (I've seen this before**).
'un'+'earth'='UNEARTH'
(Other definitions for unearth that I've seen before include "reveal" , "Dig up or find for haunter" , "Disclose" , "Disinter" , "Track down" .)