Cryptic crossword clue
In stupid way, securing degree, as expressed in particular language 13

The most common and most likely answer to this crossword clue is the 13 letter word IDIOMATICALLY

I've seen this crossword clue in The Sunday Telegraph
I
D
I
O
M
A
T
I
C
A
L
L
Y

Buddy explains!

The straight part
We know that "as expressed in particular language" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case as expressed in particular language = idiomatically.
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.

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