The most common and most likely answer to this crossword clue is the 9 letter word RETRAINED
I've seen this crossword clue in The Guardian
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More clues leading to the result RETRAINED
- Redundant staff are often kept on, Republican admitted
- Dieter ran badly and was taught new ways
- Vehicle running into grass put on new course?
- Coach in rush taught new skills
- Oils on the counter — limited bottles prepared afresh
- Interred, a rogue learned new skills
- Kept entertaining Romeo and learned something new
Buddy explains!

The straight part
We know that "learned something new" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case learned something new = retrained.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 RETRAINED mean?
RETRAINED verb- To train again; especially, to train or study in a new subject or job