Crossword Genius

Solver to prohibit including river from West Africa? (7)

Ross

I believe the answer is:

yoruban

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'from west africa?' is the definition.
I can't tell whether this definition defines the answer.

'solver to prohibit including river' is the wordplay.
'solver' becomes 'you' (the person solving the clue!).
'to prohibit' becomes 'ban' (banning is a kind of prohibiting).
'including' indicates putting letters inside.
'river' becomes 'r' (abbreviation for river).
'you'+'ban'='youban'
'youban' placed around 'r' is 'YORUBAN'.

Can you help me to learn more?

(Another definition for yoruban that I've seen is " Member of Nigerian tribe".)

I've seen this clue in The Independent.
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