Mist may be good in the garden (5)

I believe the answer is:

spray

I'm a little stuck... Click here to teach me more about this clue!

'mist' is the definition.
(I know that mist can be written as Spray)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for spray that I've seen before include "Liquid from an aerosol" , "Sprinkle water on - a small bouquet" , "Drench" , "jet?" , "Bunch of flowers" .)

I've seen this clue in the Evening Standard.

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