Ninety ton order, yet one of no account (9)

I believe the answer is:

nonentity

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'one of no account' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'ninety ton order' is the wordplay.
'order' indicates anagramming the letters.
'ninety'+'ton'='ninetyton'
'ninetyton' anagrammed gives 'NONENTITY'.

'yet' is the link.

Can you help me to learn more?

(Other definitions for nonentity that I've seen before include "No leading player" , "Unimportant person" , "cipher" , "Person of no importance" , "Insignificant person" .)

I've seen this clue in The Globe and Mail.

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