Eat in France and Switzerland (4)
I believe the answer is:
etch
'eat' is the definition.
(I've seen this before)
'in france and switzerland' is the wordplay.
'in france' becomes 'et' (I've seen this in other clues).
'and' says to put letters next to each other.
'switzerland' becomes 'ch'.
'et'+'ch'='ETCH'
(Other definitions for etch that I've seen before include "Cut; engrave" , "Draw on metal with acid" , "Score with acid" , "Use acid to design on metal or glass" , "Cut design onto metal using acid" .)