Crossword Genius

Patriarch's untaxed investment about to be raised (5)

Ross

I believe the answer is:

isaac

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'patriarch's' is the definition.
(biblical patriarch)

'untaxed investment about to be raised' is the wordplay.
'untaxed investment' becomes 'isa' (Individual Savings Account. I am not sure about the 'untaxed' bit.).
'about' becomes 'ca' (circa).
'to be raised' is a reversal indicator (going up in a down clue).
'ca' backwards is 'ac'.
'isa'+'ac'='ISAAC'

Can you help me to learn more?

(Other definitions for isaac that I've seen before include "Sir -- Newton, English scientist" , "- Newton, Eng. physicist and mathematician" , "Singer" , "Hebrew patriarch" , "Son prepared for sacrifice" .)

I've seen this clue in The Times.
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