In Riga Dean lost a flower (8)

I believe the answer is:

gardenia

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

'flower' is the definition.
(I have seen 'Fragrant flower ' mean 'gardenia' so perhaps 'flower' could also mean 'gardenia')

'in riga dean lost a' is the wordplay.
'riga dean' can be anagrammed to 'GARDENIA'.
But, I'm unsure how this is indicated.

Can you help me to learn more?

(Other definitions for gardenia that I've seen before include "Fragrant shrub, red again (anag.)" , "Drainage for shrub with white or yellow flowers" , "Shrub with fragrant flowers - in Grade A (anag)" , "Fragrant tree or shrub" , "Bad drainage produces a fragrant flower" .)

I've seen this clue in the Sydney Morning Herald.

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