Propose a trip round capital of Vietnam (7)
I believe the answer is:
advance
'propose' is the definition.
(advancing is a kind of proposing)
'a trip round capital of vietnam' is the wordplay.
'trip' becomes 'dance' (trip can mean to dance).
'round' means one lot of letters goes inside another.
'capital of' suggests taking the first letters.
The initial letter of 'vietnam' is 'v'.
'dance' placed around 'v' is 'dvance'.
'a'+'dvance'='ADVANCE'
(Other definitions for advance that I've seen before include "Bring forward" , "borrowed money" , "Go forwards" , "Move forward to get loan?" , "Move along" .)