Flowerhead of chrysanthemum, belladonna, etc (5)

I believe the answer is:

umbel

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'flowerhead' is the definition.
I can't judge whether this definition defines the answer.

'of chrysanthemum belladonna etc' is the wordplay.
'of' indicates a hidden word.
'UMBEL' can be found hidden inside 'chrysanthemum belladonna etc'.

Can you help me to learn more?

(Other definitions for umbel that I've seen before include "Flattish flower cluster" , "Flower cluster; blume (anag.)" , "floral cluster" , "Flower cluster (eg, of parsley family)" , "Flat-topped flower cluster" .)

I've seen this clue in The Irish Independent.

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