Cryptic crossword clue
Polish water supply is hot 7

The most common and most likely answer to this crossword clue is the 7 letter word BURNISH

I've seen this crossword clue in Financial Times
B
U
R
N
I
S
H

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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 BURNISH mean?

BURNISH noun
  1. Polish; lustre.
BURNISH verb
  1. To make smooth or shiny by rubbing; to polish; to shine.
  2. To shine forth; to brighten; to become smooth and glossy, as from swelling or filling out; hence, to grow large.
  3. (metaphoric) To make appear positive and highly respected.

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