Cryptic crossword clue
It's green outside but a section is corroding 7

The most common and most likely answer to this crossword clue is the 7 letter word GNAWING

G
N
A
W
I
N
G

Buddy explains!

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

GNAWING verb
  1. To bite something persistently, especially something tough.
  2. To produce excessive anxiety or worry.
  3. To corrode; to fret away; to waste.
GNAWING noun
  1. The process by which something is gnawed.
  2. A sensation of being gnawed.
GNAWING adjective
  1. (of pain or hunger) severe or intense

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