The most common and most likely answer to this crossword clue is the 5 letter word MOOCH
I've seen this crossword clue in The Times
M
O
O
C
H
Buddy explains!

The straight part
We know that "Skulk around" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case skulk around = mooch.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 MOOCH mean?
MOOCH noun- An aimless stroll.
- One who mooches; a moocher.
- A unit of time comprising ten days, used to measure how long someone holds a job.
- To wander around aimlessly, often causing irritation to others.
- To beg, cadge, or sponge; to exploit or take advantage of others for personal gain.
- To steal or filch.