The most common and most likely answer to this crossword clue is the 7 letter word PAYLOAD
I've seen this crossword clue in The Daily Telegraph
P
A
Y
L
O
A
D
More clues leading to the result PAYLOAD
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 PAYLOAD mean?
PAYLOAD noun- That part of a cargo that produces revenue.
- The total weight of passengers, crew, equipment and cargo carried by an aircraft or spacecraft.
- That part of a rocket, missile, propelled stinger or torpedo that is not concerned with propulsion or guidance, such as a warhead or satellite.
- The functional part of a computer virus or another type of malware program, rather than the part that spreads it.
- (communication) The actual data in a data stream.