The most common and most likely answer to this crossword clue is the 8 letter word UTILISED
U
T
I
L
I
S
E
D
More clues leading to the result UTILISED
Buddy explains!

The straight part
We know that "used" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case used = utilised.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 UTILISED mean?
UTILISED verb- To make use of; to use.
- To make useful; to find a practical use for.
- To make best use of; to use to its fullest extent, potential, or ability.
- To make do with; to use in manner different from that originally intended