The most common and most likely answer to this crossword clue is the 6 letter word EFFLUX
I've seen this crossword clue in The Guardian
E
F
F
L
U
X
More clues leading to the result EFFLUX
Buddy explains!
The straight part
We know that "discharge" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case discharge = efflux.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 EFFLUX mean?
EFFLUX noun- The process of flowing out.
- That which has flowed out.
- To run out; to flow forth.
- To pass away.