When a user posts his first answer, some brief guidelines are displayed:
The message Avoid asking for clarification to answers confused a user on Mathematics, who inquired about it on Mathematics Meta. That question has 10 upvotes, suggesting people agree it's confusing.
The user interpreted it as meaning that asking for clarification etc. are not allowed at all on Stack Exchange:
Really?? Seems draconian to me, unless i miss something. What if the answer isn't clear?
mixedmath clarified that it was intended to only discourage doing so in answers:
When the guidelines suggest avoiding asking for clarification or responding to other answers, they don't mean to avoid asking for clarification at all costs. Instead, they mean don't ask for clarification in your answer. [...] So to end, one can ask for clarification on answers, but this should be done in comments as opposed to other answers.
The message should therefore be clarified.