Cryptic crossword clue
The old building material leaked helium gas 7

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

I've seen this crossword clue in Independent
T
W
A
T
T
L
E

Buddy explains!

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

TWATTLE noun
  1. Chatter; twaddle.
TWATTLE verb
  1. To talk in a digressive or long-winded way.
TWATTLE verb
  1. To make much of, as a domestic animal; to pet.
TWATTLE noun
  1. A dwarf.

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