The most common and most likely answer to this crossword clue is the 10 letter word REPEATABLE
I've seen this crossword clue in The Daily Telegraph
R
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More clues leading to the result REPEATABLE
Buddy explains!
The straight part
We know that "can be served again" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case can be served again = repeatable.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 REPEATABLE mean?
REPEATABLE adjective- Able to be repeated
- (of an experiment or procedure) That gives the same results when repeated