Find a Parisian on ground (7)
I believe the answer is:
unearth
'find' is the definition.
(I know that unearth is a more specific form of locate)
'a parisian on ground' is the wordplay.
'a parisian' becomes 'un' ('a' in French).
'on' means one lot of letters go next to another (in a down clue, letters appear on others).
'ground' becomes 'earth' (synonyms).
'un'+'earth'='UNEARTH'
(Other definitions for unearth that I've seen before include "Cut a certain wire" , "Track down" , "Excavate, dig up" , "Dig up or find for haunter" , "Discover" .)