Type of investment account for Ishmael's half-brother (5)
I believe the answer is:
isaac
'ishmael's half-brother' is the definition.
(I've seen this in another clue)
'type of investment account' is the wordplay.
I cannot really understand how this works, but
'investment' could be 'isa' (Individual Savings Account) and 'isa' is found in the answer.
'account' could be 'ac' (abbreviation) and 'ac' is present in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
'for' is the link.
Can you help me to learn more?
(Other definitions for isaac that I've seen before include "Jacob's father" , "- Newton, Eng. physicist and mathematician" , "Son almost sacrificed" , "Sacrificial offering" , "man whose sons bargained over 3 [A MESS OF POTAGE]" .)