Person helping to write out names in USA (10)

I believe the answer is:

amanuensis

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'person helping to write' is the definition.
I can't tell whether this defines the answer.

'out names in usa' is the wordplay.
'out' is an anagram indicator.
'names'+'in'+'usa'='namesinusa'
'namesinusa' anagrammed gives 'AMANUENSIS'.

Can you help me to learn more?

(Other definitions for amanuensis that I've seen before include "dictator's collaborator, perhaps" , "stenographer" , "secretarial post" , "Literary assistant - scribe" , "Secretary" .)

I've seen this clue in The Independent.

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