The most common and most likely answer to this crossword clue is the 9 letter word RELAPSING
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More clues leading to the result RELAPSING
Buddy explains!

The straight part
We know that "having another episode" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case having another episode = relapsing.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 RELAPSING mean?
RELAPSING verb- To fall back again; to slide or turn back into a former state or practice.
- (of a disease) To recur; to worsen, be aggravated (after a period of improvement).
- To slip or slide back physically; to turn back.
- A relapse.