清書 (seisho) means “clean copy” | MotiTan Japanese Dictionary

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提出する前に、答案を清書しました。tei shutsu su ru mae ni tō an o sei sho shi ma shi ta

I made a clean copy of my answer sheet before submitting it.

Describes rewriting a draft into a neat final version ready to submit or keep.

浄書jōsho: A formal term for a neat final copy of a written work.
最終稿saishūkō: The final version of a manuscript after revisions are complete.

下書きした文章などを、提出や保存に適するように整えて書き直したもの。shita ga ki shi ta bun shō na do o tei shutsu ya ho zon ni teki su ru yō ni totono e te ka ki nao shi ta mo no

The word 清書 (seisho) consists of 清 (sei, "clear") and 書 (sho, "writing"), both read with Sino-Japanese readings.

In Japanese classrooms, 清書 (seisho) often appears as a stage label in a writing process, marking the polished version that follows planning and drafting.