Formal outdoor feature that could spell danger for setter? (4,6)
I believe the answer is:
knot garden
'formal outdoor feature that' is the definition.
I can't judge whether this definition defines the answer.
'spell danger for setter?' is the wordplay.
'spell' indicates an anagram (I've seen 'spells' mean this (I've seen this in other clues)).
'for' is a charade indicator (letters next to each other) (I've seen this in other clues).
'setter?' becomes 'knot' (I can't justify this - if you can you should give a lot more credence to this answer).
'danger' is an anagram of 'garden'.
'garden' after 'knot' is 'KNOT GARDEN'.
'could' is the link.
Can you help me to learn more?
(Another definition for knot garden that I've seen is " beautifully designed beds".)