Cryptic crossword clue
He dealt poorly with non-monogamous behaviour, being lazy 8,3,4

The most common and most likely answer to this crossword clue is the 8 plus 3 plus 4 letter word SWINGING THE LEAD

I've seen this crossword clue in The Guardian
S
W
I
N
G
I
N
G
T
H
E
L
E
A
D

Buddy explains!

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.

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