Cryptic crossword clue
Enthusiastic doctor resigned after end of case 9

The most common and most likely answer to this crossword clue is the 9 letter word ENERGISED

I've seen this crossword clue in The Guardian
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Buddy explains!

The straight part
We know that "Enthusiastic" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case enthusiastic = energised.
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 ENERGISED mean?

ENERGISED adjective
  1. Alternative spelling of energized
ENERGISED verb
  1. To invigorate; to make energetic.
  2. To supply with energy, especially electricity; to turn on power to (something).
  3. To use strength in action; to act or operate with force or vigor; to act in producing an effect.

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