New court rule hit garden business (12)

I believe the answer is:

horticulture

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'garden business' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'new court rule hit' is the wordplay.
'new' is an anagram indicator.
'court'+'rule'+'hit'='courtrulehit'
'courtrulehit' anagrammed gives 'HORTICULTURE'.

Can you help me to learn more?

(Other definitions for horticulture that I've seen before include "after grasses etc" , "What gardener does" , "Science of gardening" .)

I've seen this clue in The Times.

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