Crossword Genius

I help regulars, uprooting exceptional plant (6)

Ross

I believe the answer is:

dahlia

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

'plant' is the definition.
(dahlia is a kind of plant)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for dahlia that I've seen before include "Tuberous garden plant" , "Tuberous plant with showy flowers" , "Strangely, Ali had this flower" , "Composite" , "Showy bloom" .)

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