Cryptic crossword clue
Low air of old harbour set up on field 11

The most common and most likely answer to this crossword clue is the 11 letter word TROPOSPHERE

I've seen this crossword clue in The Times
T
R
O
P
O
S
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H
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Buddy explains!

The straight part
We know that "Low air" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case low air = troposphere.
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 TROPOSPHERE mean?

TROPOSPHERE noun
  1. The lower levels of the atmosphere extending from the surface of the Earth or another celestial body up to the tropopause. It is characterized by convective air movements and a large vertical temperature change.

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