The most common and most likely answer to this crossword clue is the 14 letter word SMASH-AND-GRAB
S
M
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Buddy explains!
The straight part
We know that "Robbery with violence" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case robbery with violence = smash-and-grab.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 SMASH-AND-GRAB mean?
SMASH-AND-GRAB noun- A robbery where a window of a shop or other premises is smashed and items are grabbed as quickly as possible.
- (by extension) An act of theft, appropriation, or other form of gaining advantage at another's expense that is done quickly and audaciously.