The most common and most likely answer to this crossword clue is the 8 letter word UNDERUSE
I've seen this crossword clue in Financial Times
U
N
D
E
R
U
S
E
More clues leading to the result UNDERUSE
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.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does UNDERUSE mean?
UNDERUSE noun- The act of using (something) less than expected.
- To use (something) less than expected