OK, I mean someone who believes in the establishment of a Jewish state when I use the term "Zionist". It is not related to any religion since Zionism is an ideology, not a religious or ethnic movement.
This is a good explanation of it and why someone who is protests Zionism and Israel isn't "anti-semitic". Being called "anti-Semitic" when one criticises Israel or Zionism is humourous since Zionists have long been supported by Anti-semites.
Who else would want to see Jews ghettoised other than an anti-semite?