The most common and most likely answer to this crossword clue is the 6 letter word ARTFUL
A
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T
F
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More clues leading to the result ARTFUL
- Drawing energy released by power source can be tricky
- Crafty revolutionary paper cuts a limited order
- Unnatural cunning
- Crafty Rex admitted to fault – that’s unusual
- Description of packed gallery, perhaps — almost masterly
- Like Jack Dawkins in painting almost complete
- Cunning manipulating fault to steal run
- Clever method’s nearly complete
Buddy explains!

The straight part
We know that "masterly" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case masterly = artful.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does ARTFUL mean?
ARTFUL adjective- Cunning; tending toward indirect dealings; crafty.
- Performed with, or characterized by, art or skill.
- Artificial; imitative.
- Using or exhibiting much art, skill, or contrivance; dexterous; skillful.