Crossword Genius

Bill is a leading man (5)

Ross

I believe the answer is:

isaac

'man' is the definition.
(I've seen this before)

'bill is a leading' is the wordplay.
'bill' becomes 'ac' (short for account).
'leading' is a charade indicator (letters next to each other).
'is'+'a'='isa'
'ac' put after 'isa' is 'ISAAC'.

(Other definitions for isaac that I've seen before include "Jewish name?" , "Sir -- Newton, English scientist" , "Biblical patriarch" , "Esau's father" , "-- Asimov, science fiction writer" .)

I've seen this clue in The Telegraph.
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