The most common and most likely answer to this crossword clue is the 8 letter word REUSABLE
I've seen this crossword clue in Financial Times
R
E
U
S
A
B
L
E
Buddy explains!
The straight part
We know that "can be employed again" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case can be employed again = reusable.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 REUSABLE mean?
REUSABLE noun- Any product, such as a diaper, that is not disposable but can be used more than once.
- Able to be used again; especially after salvaging or special treatment or processing
- (of a program) Able to be executed by several tasks without being reloaded; either reentrant or serially reusable