Cryptic crossword clue
Little time in garden for astronautical science 8

The most common and most likely answer to this crossword clue is the 8 letter word ROCKETRY

I've seen this crossword clue in The Guardian
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Buddy explains!

The straight part
We know that "astronautical science/astronautical science" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case astronautical science/astronautical science = rocketry.
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 ROCKETRY mean?

ROCKETRY noun
  1. The making and launching of rockets, its science and practice.

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