Cryptic crossword clue
Corrosion on countercovered  by iron foil  mostly acid

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

F
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Buddy explains!

The straight part
We know that "foil" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case foil = frustrate.
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 FRUSTRATE mean?

FRUSTRATE verb
  1. To disappoint or defeat; to vex by depriving of something expected or desired.
  2. To hinder or thwart.
  3. To cause stress or annoyance.
FRUSTRATE adjective
  1. Ineffectual; useless; fruitless.

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