Plant ground more millet (10)

I believe the answer is:

immortelle

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'plant ground more millet' is the definition.
'immortelle' can be an answer for 'plant' (I've seen this before). I am unsure of the 'ground more millet' bit.

'ground more millet' is the wordplay.
'ground' is an anagram indicator ('grind' the letters into a new form).
'more'+'millet'='moremillet'
'moremillet' with letters rearranged gives 'IMMORTELLE'.

Can you help me to learn more?

(Another definition for immortelle that I've seen is " plant".)

I've seen this clue in The Guardian.

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