A number of those caught up in fortune-telling (3)

I believe the answer is:

ten

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'a number of' is the definition.

'up in fortune-telling' is the wordplay.
'up' says the letters should be written in reverse (in down clue: letters go upwards).
'in' indicates the answer is hidden within the clue.
'net' is hidden within 'fortune telling'.
'net' backwards is 'TEN'.

'those caught' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for ten that I've seen before include "How many" , "time" , "Dudley Moore/Bo Derek film" , "No of sides of a decagon" , "Cardinal number" .)

I've seen this clue in The Irish Times.

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