The most common and most likely answer to this crossword clue is the 19 letter word UNDERÂ CONSIDERATION
I've seen this crossword clue in The Guardian
U
N
D
E
R
Â
C
O
N
S
I
D
E
R
A
T
I
O
N
Buddy explains!
The straight part
We know that "being dealt with" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case being dealt with = under consideration.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.