The most common and most likely answer to this crossword clue is the 12 letter word CONSTITUENCY
I've seen this crossword clue in Financial Times
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More clues leading to the result CONSTITUENCY
Buddy explains!
The straight part
We know that "Which votes" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case which votes = constituency.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does CONSTITUENCY mean?
CONSTITUENCY noun- A district represented by one or more elected officials.
- (collective) The voters within such a district.
- (collective) The residents of such a district.
- (collective) The voters of a candidate.
- An interest group or fan base.