Crossword Genius

Ring up about one garden shrub (5)

Ross

I believe the answer is:

lilac

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

'one garden shrub' is the definition.
'lilac' can be an answer for 'shrub' (lilac is a kind of shrub). I am unsure of the 'one garden' bit.

'ring up about' is the wordplay.
'ring up' becomes 'lila' (I can't justify this - if you can you should give a lot more credence to this answer).
'about' becomes 'c' (circa).
'lila'+'c'='LILAC'

Can you help me to learn more?

(Other definitions for lilac that I've seen before include "Shrub (but not always this colour)" , "Shade" , "Spiritual knowledge" , "I call (anag)" , "Shrub with fragment purple or white flowers" .)

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