Crossword Genius

One of the first names in the Biblical phone book? (5)

Ross

I believe the answer is:

aaron

I'm a little stuck... Click here to teach me more about this clue!

'biblical phone book?' is the definition.
The definition suggests a singular noun which matches the answer.

'one of the first names in the' is the wordplay.
'one' becomes 'an' (an apple is one apple).
'of' becomes 'o''.
'the first' means one lot of letters go next to another.
'names' becomes 'ar' (I can't justify this - if you can you should give a lot more credence to this answer).
'in the' means one lot of letters goes inside another.
'o' put after 'ar' is 'aro'.
'an' going around 'aro' is 'AARON'.

Can you help me to learn more?

(Other definitions for aaron that I've seen before include "Boy" , "leader's brother" , "Elder brother of Moses" , "Brother of Moses who had blessed rod" , "OT character" .)

I've seen this clue in the Evening Standard.
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