The most common and most likely answer to this crossword clue is the 10 letter word JOURNEYMAN
I've seen this crossword clue in The Times
J
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More clues leading to the result JOURNEYMAN
Buddy explains!

The straight part
We know that "Capable worker" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case capable worker = journeyman.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 JOURNEYMAN mean?
JOURNEYMAN noun- A tradesman who has served an apprenticeship and is employed by a master tradesman
- A competent but undistinguished tradesman, especially one who works, and is paid by the day
- A player who plays on many different teams during the course of his career