Politician enters Vietnamese holiday draw (5)
I believe the answer is:
tempt
'draw' is the definition.
(I've seen this before)
'politician enters vietnamese holiday' is the wordplay.
'politician' becomes 'MP' (Member of Parliament).
'enters' is an insertion indicator.
'vietnamese holiday' becomes 'tet' (I've seen this in another clue).
'mp' going within 'tet' is 'TEMPT'.
(Other definitions for tempt that I've seen before include "Put to the test" , "draw" , "Entice - give rise to desire" , "Entice; risk provoking (fate)" , "Try to persuade to do wrong" .)