A garden shrub Cilla ordered (5)

I believe the answer is:

lilac

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

'a garden shrub' is the definition.
'lilac' can be an answer for 'shrub' (lilac is a kind of shrub). I am not sure about the 'a garden' bit.

'cilla ordered' is the wordplay.
'ordered' is an anagram indicator.
'cilla' anagrammed gives 'LILAC'.

Can you help me to learn more?

(Other definitions for lilac that I've seen before include "Spiritual knowledge" , "Lavender colour" , "Plant" , "Shrub with fragrant pink, purple or white flowers" , "Genus Syringa shrub" .)

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