Crossword Genius

Ruler therefore in poor area is the cause of rising (6,4)

Ross

I believe the answer is:

baking soda

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

'the cause of rising' is the definition.
I can't tell whether this defines the answer.

'ruler therefore in poor area' is the wordplay.
'ruler' becomes 'king' (king is a kind of ruler).
'therefore' becomes 'so' (I've seen this in another clue).
'in' is an insertion indicator.
'poor area' becomes 'bada' (I can't justify this - if you can you should believe this answer much more).
'king'+'so'='kingso'
'kingso' put into 'bada' is 'BAKING-SODA'.

'is' is the link.

Can you help me to learn more?

(Other definitions for baking soda that I've seen before include "Common name for sodium bicarbonate" , "possible antacid" .)

I've seen this clue in The Telegraph.
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