A small tweak or bit of ingenuity; a little extra effort or clever adjustment to improve something.
この料理は一工夫すればもっとおいしくなるよ。
With a small tweak, this dish will taste even better.
プレゼン資料に一工夫して、見やすくした。
I made a little adjustment to the presentation materials to make them easier to read.
説明に一工夫すれば、初心者にも分かりやすくなる。
If you add a bit of ingenuity to the explanation, it will be easier for beginners to understand.