The most common and most likely answer to this crossword clue is the 7 letter word PAKAPOO
P
A
K
A
P
O
O
Buddy explains!
The straight part
We know that "Lottery" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case lottery = pakapoo.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 PAKAPOO mean?
PAKAPOO noun- A Chinese lottery game popular in Oceania in the 19th century, involving tickets marked with rows of Chinese characters.