Crossword Genius

Biblical patriarch's investment account (5)

Ross

I believe the answer is:

isaac

'biblical patriarch's' is the definition.
(I've seen this before)

'investment account' is the wordplay.
'investment' becomes 'isa' (Individual Savings Account).
'account' becomes 'ac' (abbreviation).
'isa'+'ac'='ISAAC'

(Other definitions for isaac that I've seen before include "Singer" , "Biblical father of twins" , "Father to Jacob and Esau" , "Son prepared for sacrifice" , "designated victim" .)

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