Whistle-blower inconclusive on promise not to reveal votes (9)
I believe the answer is:
referenda
'votes' is the definition.
(referendum is a kind of vote)
'whistle-blower inconclusive on promise not' is the wordplay.
'whistle blower' becomes 'referee' (I've seen this in another clue).
'inconclusive' means to remove the last letter.
'on' is a charade indicator (letters next to each other).
'promise not' becomes 'nda' (I can't explain this - if you can you should believe this answer much more).
'referee' with its final letter removed is 'refere'.
'refere'+'nda'='REFERENDA'
'to reveal' acts as a link.
Can you help me to learn more?
(Other definitions for referenda that I've seen before include "submissions to people" , "decisions for people" , "National ballots on specific issues" , "National votes or plebiscites (9)" , "mass votes" .)