Phone Suburban in Ottery or Goodwood Sports, they might have stock of the clicker and spring. Don't think they are cheap though.
If you can't put it in yourself, phone OLD SALT (Jonathan) to help you. He is one of the reel gurus in Cape Town. 08two 69one 873three.
My opinion, don't stress about the clicker, it serves no purpose other than clicking.
Took mine out when I got my reel and placed the spring behind my dog pawl. More important i.m.o.