The most common and most likely answer to this crossword clue is the 7 letter word ROCKERY
I've seen this crossword clue in The Daily Telegraph
R
O
C
K
E
R
Y
More clues leading to the result ROCKERY
- Kitchenware chipped on top used for garden feature
- Hesitation shown in unstable part of garden
- Pop star back in country garden
- China’s leader ignored garden feature
- Musician with yen to make garden feature
- Outdoor feature film about queen
- Part of garden where rowdy biker’s unknown
- What gardener manages having no time for 14 science?
- Fan of 23s feeds boxer in part of garden
- Earthenware pots initially rejected for garden feature
Buddy explains!

The straight part
We know that "garden feature" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case garden feature = rockery.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 ROCKERY mean?
ROCKERY noun- A section of a garden made from decorative rocks and alpine plants.
- A natural area where many seals breed.