Measuring out items for the garden (9)

I believe the answer is:

geraniums

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'items for the garden' is the definition.
I can't tell whether this defines the answer.

'measuring out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'measuring' anagrammed gives 'GERANIUMS'.

Can you help me to learn more?

I've seen this clue in The Independent.

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