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"competently" is also used as a crossword clue. If that's what you saw, the answer is often ably (4 letters).
Definitions
with competence; in a competent capable manner
Word origin
From competent + -ly.
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Able to perform”11 letters
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