Crossword Genius

Sarah's boy is a Bill (5)

Ross

I believe the answer is:

isaac

'sarah's boy' is the definition.
(son of Sarah in the Bible)

'is a bill' is the wordplay.
'bill' becomes 'ac' (short for account).
'is'+'a'+'ac'='ISAAC'

(Other definitions for isaac that I've seen before include "Actor Oscar" , "one in Genesis" , "Father to Jacob and Esau" , "one almost sacrificed" , "Sarah's son" .)

I've seen this clue in The Times.
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