Cryptic crossword clue
Old copper mostly abundant in round window 6

The most common and most likely answer to this crossword clue is the 6 letter word OCULUS

O
C
U
L
U
S

Buddy explains!

The straight part
We know that "round window" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case round window = oculus.
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 OCULUS mean?

OCULUS noun
  1. A window or other opening that has an oval or circular shape (as of an eye).

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