The most common and most likely answer to this crossword clue is the 7 letter word SNEAKER
I've seen this crossword clue in The Guardian
S
N
E
A
K
E
R
Buddy explains!
The straight part
We know that "One stealing/a shoe" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one stealing/a shoe = sneaker.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 SNEAKER mean?
SNEAKER noun- One who sneaks.
- An athletic shoe with a soft, rubber sole.
- A vessel of drink.
- A sneaker male.