The most common and most likely answer to this crossword clue is the 7 letter word PARTAKE
I've seen this crossword clue in The Times
P
A
R
T
A
K
E
More clues leading to the result PARTAKE
Buddy explains!

The straight part
We know that "Have some" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case have some = partake.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 PARTAKE mean?
PARTAKE verb- To take part in an activity; to participate.
- To take a share or portion (of or in).
- To have something of the properties, character, or office (of).