African flower grain AA fermented (7)

I believe the answer is:

niagara

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

'african flower' is the definition.
'Niagara' can be an answer for 'flower' (I've seen this before). I'm unsure of the 'african' bit.

'grain aa fermented' is the wordplay.
'fermented' indicates anagramming the letters.
'grain'+'aa'='grainaa'
'grainaa' is an anagram of 'NIAGARA'.

Can you help me to learn more?

(Other definitions for niagara that I've seen before include "Large water falls" , "It falls in North America" , "Great waterfalls on US-Canada border" , "River forming part of US-Canada border" , "N. American waterfall" .)

I've seen this clue in The Sun.

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