Cryptic crossword clue
Current of air rattling thin guard 9

The most common and most likely answer to this crossword clue is the 9 letter word INDRAUGHT

I've seen this crossword clue in The Times
I
N
D
R
A
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T

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The straight part
We know that "Current of air" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case current of air = indraught.
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 INDRAUGHT mean?

INDRAUGHT noun
  1. An inward flow of air or water
  2. An opening from the sea into the land; an inlet.

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