Tangible diplomacy over French island (7)
I believe the answer is:
tactile
'tangible' is the definition.
(similar in meaning)
'diplomacy over french island' is the wordplay.
'diplomacy' becomes 'tact' (tact can mean diplomacy or sensitivity).
'over' means one lot of letters go next to another.
'french island' becomes 'ile' ('island' in French).
'tact'+'ile'='TACTILE'
(Other definitions for tactile that I've seen before include "Tangible - of touch" , "Lattice (anag.)" , "Given to touching" , "Using the sense of touch as in lattice" , "Relating to the sense of touch" .)