The most common and most likely answer to this crossword clue is the 7 plus 7 letter word POLLING STATION
I've seen this crossword clue in The Daily Telegraph
P
O
L
L
I
N
G
S
T
A
T
I
O
N
More clues leading to the result POLLING STATION
- Good way to cut use of fertiliser? It gets my vote!
- At times school may be one good way into worker’s job
- Here you can make your mark cutting post
- Revolting, sickly, nasty smell about TV channel in the home of democracy?
- A building in which political opponents will get cross more than once
- Place where everyone turns out for a party?
- Where people vote for cutting radio broadcaster
- Key fact in reproduction method where crosses accumulate
Buddy explains!

The straight part
We know that "A building in which political opponents will get cross more than once" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a building in which political opponents will get cross more than once = polling station.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.