The most common and most likely answer to this crossword clue is the 13 letter word DOUBLE-GLAZED
I've seen this crossword clue in Financial Times
D
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G
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More clues leading to the result DOUBLE-GLAZED
Buddy explains!

The straight part
We know that "offering more protection" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case offering more protection = double-glazed.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 DOUBLE-GLAZED mean?
DOUBLE-GLAZED adjective- Having double glazing.