Cryptic crossword clue
Anti-corrosion treatment in the main embraced by junior employee 12

The most common and most likely answer to this crossword clue is the 12 letter word UNDERSEALING

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Buddy explains!

The straight part
We know that "Anti-corrosion treatment" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case anti-corrosion treatment = undersealing.
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 UNDERSEALING mean?

UNDERSEALING verb
  1. To coat (the underbody or chassis of a vehicle) with underseal.

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