I often find myself waiting on the homepage of math.stackexchange.com, searching if there's a question I can answer. However, if I find a question (not posted by me), which is interesting for me, then I go and read the answers.
Many times it happens with me that the question has become inactive or OP has accepted some answer, not necessarily the one I am interested in. However, I need clarification on some part of the answer.
For example, I don't understand how the answerer went from second step to third step or which theorem is implicitly used in the answer or so on.
Is it okay for me to comment on answers of questions which are not related to me (I am neither OP nor answerer), just because I am interested in math? I know I can post a separate question, but many times the answer is only one word and is related to that particular answer; and a separate question would be an overkill.
TL;DR: Should I post on others' answers asking for clarification? Is it rude? Is the answerer supposed to clarify or they can just ignore my request?