In America, can all others prepare to ditch leader (4,4)

I believe the answer is:
rest room
'in america can' is the definition.
'rest room' can be an answer for 'can' (rest room is a kind of can). I'm unsure of the 'in america' bit.
'all others prepare to ditch leader' is the wordplay.
'all others' becomes 'rest' (as in the rest of a group).
'prepare' becomes 'groom' (eg grooming someone for a job).
'to ditch leader' means to remove the first letter.
'groom' with its first letter taken off is 'room'.
'rest'+'room'='REST ROOM'
Can you help me to learn more?
(Other definitions for rest room that I've seen before include "Polite toilet in a public building - relax in it" , "convenience?" , "American can" , "Lavatory" , "Public toilet (US)" .)
