Cryptic crossword clue
Scottish island, one — nearly one — in part of window 7

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

M
U
L
L
I
O
N

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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 MULLION mean?

MULLION noun
  1. A vertical bar between the panes of glass or casements of a window or the panels of a screen.
MULLION verb
  1. To shape into divisions by means of mullions.

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