Stick to a veto all round (5)
I believe the answer is:
baton
'stick' is the definition.
(term for a stick or staff)
'to a veto all round' is the wordplay.
'a veto' becomes 'ban' (I've seen this before).
'all round' indicates putting letters inside.
'to' placed within 'ban' is 'BATON'.
(Other definitions for baton that I've seen before include "Staff" , "Piece of equipment" , "Policeman's truncheon" , "weapon" , "Short stick" .)