Vermouth's knocked back after caviare? It's on the menu in Switzerland (6)
I believe the answer is:
roesti
'on the menu in switzerland' is the definition.
I know nothing about this answer so I can't tell whether this works.
'vermouth's knocked back after caviare?' is the wordplay.
'vermouth's' becomes 'it's' (short for 'Italian vermouth' as in 'gin and it').
'knocked back' says the letters should be written backwards.
'after' means one lot of letters go next to another.
'caviare?' becomes 'roe' (caviare is a kind of roe).
'its' reversed gives 'sti'.
'sti' after 'roe' is 'ROESTI'.
'it's' acts as a link.
Can you help me to learn more?
(Another definition for roesti that I've seen is " fried dish using potatoes".)