Number seven in Etymology section (6)

I believe the answer is:

ninety

'number' is the definition.
(ninety is a kind of number)

'seven in etymology section' is the wordplay.
'section' says the answer is hidden in the clue.
'NINETY' is hidden in the letters of 'seven in etymology'.

(Other definitions for ninety that I've seen before include "XC in Roman numerals" , "high number" , "Figure in inn, yet, strangely" , "old age" , "nearly a ton" .)

I've seen this clue in The Independent.

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