Content with the quantity (3)

I believe the answer is:

ten

'the quantity' is the definition.
(ten is a kind of quantity)

'content with' is the wordplay.
'with' says the answer is hidden in the clue.
'TEN' is hidden within 'content'.

(Other definitions for ten that I've seen before include "Dudley Moore/Bo Derek film" , "No of sides of a decagon" , "Cardinal number" , "X-WORD" , "Five times two" .)

I've seen this clue in The Mirror.

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