The most common and most likely answer to this crossword clue is the 7 letter word SPOOFED
I've seen this crossword clue in The Guardian
S
P
O
O
F
E
D
More clues leading to the result SPOOFED
Buddy explains!

The straight part
We know that "sent up" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sent up = spoofed.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 SPOOFED mean?
SPOOFED verb- To gently satirize.
- To deceive.
- To falsify.
- To ejaculate, to come.
- Parodied.
- (of an email) Made to appear to have come from someone other than the real sender.