Cryptic crossword clue
Display of determination to take care of surplus material

The most common and most likely answer to this crossword clue is the 4 plus 4 plus 6 letter word MIND OVER MATTER

I've seen this crossword clue in The Guardian
M
I
N
D
O
V
E
R
M
A
T
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R

Buddy explains!

The straight part
We know that "Display of determination" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case display of determination = mind over matter.
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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