The most common and most likely answer to this crossword clue is the 9 letter word TERRACING
I've seen this crossword clue in Independent
T
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The straight part
We know that "traditional area of ground" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case traditional area of ground = terracing.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 TERRACING mean?
TERRACING verb- To provide something with a terrace.
- To form something into a terrace.
- The formation of terraces.
- A terraced structure.
- A series of terraces.
- A stand with a series of tiers.