Cryptic crossword clue
Recovered from illness, we hear, passed at higher level 8

The most common and most likely answer to this crossword clue is the 8 letter word OVERFLEW

I've seen this crossword clue in The Sunday Telegraph
O
V
E
R
F
L
E
W

Buddy explains!

The straight part
We know that "passed at higher level" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case passed at higher level = overflew.
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 OVERFLEW mean?

OVERFLEW verb
  1. To fly over something.
  2. To fly too far past something.

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