The most common and most likely answer to this crossword clue is the 6 plus 3 letter word TASMAN SEA
I've seen this crossword clue in The Guardian
T
A
S
M
A
N
S
E
A
More clues leading to the result TASMAN SEA
- A small island’s in these empty Australian waters!
- The main beverage attracting staff aboard carrier
- A small isle’s in the drink, or one part of it
- Quantity of drink and chap’s occupying a seat drunkenly
- The main asset a man shifts
- Distant waves and cheers when minister’s house opens
- NASA teams altered body of water
- A small guy’s tucked into drink
- Chap stopping fool in afternoon meal getting some water
Buddy explains!

The straight part
We know that "some water" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case some water = tasman sea.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.