Cryptic crossword clue
To act smartly, criminal’s beginning to get jemmy under crate 3,6

The most common and most likely answer to this crossword clue is the 3 plus 6 letter word BOX CLEVER

I've seen this crossword clue in The Daily Telegraph
B
O
X
C
L
E
V
E
R

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.
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