Cryptic crossword clue
Old pasty keeps in whitish glass 7

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

I've seen this crossword clue in The Times
O
P
A
L
I
N
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Buddy explains!

The straight part
We know that "whitish glass" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case whitish glass = opaline.
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 OPALINE mean?

OPALINE noun
  1. A clear to white liquid secreted by sea hares (genus Aplysia) that becomes viscous upon contact with water
  2. Any of several minerals resembling opal, including a variety of yellow chalcedony
  3. Opal glass
OPALINE adjective
  1. Resembling opal in its iridescence; having a milky white iridescence.

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