Crossword Genius

Comprehensive sees promotion for the lowliest of blossoms (6)

Ross

I believe the answer is:

floral

'of blossoms' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

(Other definitions for floral that I've seen before include "Decorated with blooms" , "Sort of tribute or dance" , "Decorated with flowers" , "Of flowers, like wreath" , "Place for seaside holiday" .)

I've seen this clue in The Independent.
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