Cryptic crossword clue
Unhealthy ingredient in tart regularly ruined fantastic day 5,5,4

The most common and most likely answer to this crossword clue is the 5 plus 5 plus 4 letter word TRANS FATTY ACID

T
R
A
N
S
F
A
T
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A
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D

Buddy explains!

The straight part
We know that "Unhealthy ingredient" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case unhealthy ingredient = trans fatty acid.
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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