Lure politician into Vietnamese festival (5)
I believe the answer is:
tempt
'lure' is the definition.
(I know that lure can be written as tempt)
'politician into vietnamese festival' is the wordplay.
'politician' becomes 'MP' (Member of Parliament).
'into' is an insertion indicator.
'vietnamese festival' becomes 'tet' (I've seen this in another clue).
'mp' put into 'tet' is 'TEMPT'.
(Other definitions for tempt that I've seen before include "Entice; risk provoking (fate)" , "Entice, lure" , "Bait" , "Invite" , "Put to the test" .)