Give over or it may be vetoed (6)
I believe the answer is:
devote
'give over' is the definition.
'devote' can be an answer for 'give' (synonyms). I'm not certain of the 'over' bit.
'it may be vetoed' is the wordplay.
'it may be' indicates an anagram (I've seen this in other clues).
'vetoed' with letters rearranged gives 'DEVOTE'.
'or' acts as a link.
Can you help me to learn more?
(Other definitions for devote that I've seen before include "Dedicate totally" , "Commit" , "Resolutely apply" , "Appropriate to" , "Set apart" .)