The most common and most likely answer to this crossword clue is the 5 plus 4 letter word NASTY MESS
N
A
S
T
Y
M
E
S
S
Buddy explains!
The straight part
We know that "crap (or shit?)" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case crap (or shit?) = nasty mess.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.