かつて
once, formerly
Back when he was still a student, which was long enough ago that it wants saying in a different tense. The cats かつ were doing theirs at three even then: かつて.
Near 勝手 かって in sound only. 一度 いちど is once as in one time. かつて is once as in back then.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.