Mellifluous little lilac is umbelliferous when raised (7)

I believe the answer is:

musical

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

'mellifluous' is the definition.
(thesaurus)

'little lilac is umbelliferous when raised' is the wordplay.
'MUSICAL' is hidden back-to-front in amongst the letters.
But, I am unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for musical that I've seen before include "Form of theatre" , "Type of stage show" , "Rent for one" , "Cats maybe" , "Cats perhaps" .)

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

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