CLB is acceptedCLB is no more accepted . check instructions guidelines on cic website. it is clearly mentioned IELTS General or CELPIP .
Although we all know academic IELTS is much difficult and worth more than general one but unfortunately officers can't comprehend simple things.
Best of luck.
What language level do I need when I apply for citizenship?
If you are between the ages of 18 and 54 on the date you sign your application, you must meet the Canadian Language Benchmarks Level 4 (CLB 4) or higher in speaking and listening.
then you send them the paper that shows your level