Cryptic crossword clue
One coming in again on medical department’s complaint 9

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

R
E
E
N
T
R
A
N
T

Buddy explains!

The straight part
We know that "One coming in again" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one coming in again = reentrant.
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 REENTRANT mean?

REENTRANT noun
  1. An angle or part that reenters itself.
  2. One who enters (the labour market, etc.) again.
  3. A valley between a pair of parallel ridges
REENTRANT adjective
  1. Reentering; pointing inward.
  2. (of a mutual exclusion mechanism) Such that the corresponding lock can be reacquired by the locking thread.
  3. That may be executed more than once at a time either by different threads, or because of recursion.
  4. (of a part of a rocket) Designed to return to the Earth's atmosphere.
  5. Of or pertaining to reentry (in the heart)
  6. (of a ukulele or similar instrument) Having the strings not ordered according to pitch (having a re-entry)

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