Crossword Genius

Not easily disturbed by question and answer in rising river (7)

Ross

I believe the answer is:

equable

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

'not easily disturbed' is the definition.

'question and answer in rising river' is the wordplay.
'question and answer' becomes 'qua' (I can't justify this - if you can you should give a lot more credence to this answer).
'in' indicates putting letters inside.
'rising' says the letters should be written backwards (going up in a down clue).
'river' becomes 'elbe' (river in Germany).
'elbe' in reverse letter order is 'eble'.
'qua' placed inside 'eble' is 'EQUABLE'.

'by' acts as a link.

Can you help me to learn more?

(Other definitions for equable that I've seen before include "Not extreme" , "Not easily angered" , "Cool" , "Calm, even-tempered" , "composed" .)

I've seen this clue in The Telegraph.
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