Cryptic crossword clue
With immediate effect, a low temperature brings round precipitation 2,2,3

The most common and most likely answer to this crossword clue is the 2 plus 2 plus 3 letter word AS OF NOW

I've seen this crossword clue in The Times
A
S
O
F
N
O
W

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The straight part
We know that "With immediate effect" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case with immediate effect = as of now.
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.

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