* Incorrect verb tense: "Speak" should be "spoken". The sentence needs a past participle to form the passive voice.
* Word order: "Speak clear" is awkward. It should be "clearly spoken".
* Redundancy: "Clear" and "hear" are somewhat redundant. The idea of hearing implies clarity.
Here are some ways to correct the sentence:
* The words of puppeteers must be clearly spoken for all to hear.
* Puppeteers must speak clearly so everyone can hear them.
* The words of puppeteers should be clear enough for everyone to understand.