Cryptic crossword clue
Rate bacon “bad” on account of salt 9

The most common and most likely answer to this crossword clue is the 9 letter word CARBONATE

I've seen this crossword clue in The Guardian
C
A
R
B
O
N
A
T
E

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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 CARBONATE mean?

CARBONATE noun
  1. Any salt or ester of carbonic acid.
CARBONATE verb
  1. To charge (often a beverage) with carbon dioxide.

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