Crossword Genius

Nine pearls designed for Ginger and Rosemary, for instance (10)

Ross

I believe the answer is:

perennials

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

'ginger and rosemary for instance' is the definition.
I can't judge whether this definition defines the answer.

'nine pearls designed' is the wordplay.
'designed' indicates an anagram (designed with the letters).
'nine'+'pearls'='ninepearls'
'ninepearls' with letters rearranged gives 'PERENNIALS'.

'for' is the link.

Can you help me to learn more?

I've seen this clue in the Irish Times (Crosaire) and The Irish Times.
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