American shorthand fast enough? Not entirely (5)

I believe the answer is:

steno

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'american' is the definition.
Both the answer and definition are singular nouns.
Maybe there's an association between them I don't understand?

'shorthand fast enough? not entirely' is the wordplay.
'not entirely' indicates a hidden word.
'STENO' is hidden within 'shorthand fast enough'.

Can you help me to learn more?

(Other definitions for steno that I've seen before include "US secretary perhaps" , "Old-fashioned secretary" , "US typist" .)

I've seen this clue in The Guardian.

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