Capturing back upset duchess imprisoned by group (8)

I believe the answer is:

retaking

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'capturing' is the definition.
(retaking is a kind of capturing)

'back upset duchess imprisoned by group' is the wordplay.
'back' shows that the letters should be reversed in order.
'upset duchess' becomes 'kate' (Catherine, Duchess of Cambridge. I am not sure about the 'upset' bit.).
'imprisoned by' means one lot of letters goes inside another.
'group' becomes 'ring' (a ring is a criminal organisation).
'kate' in reverse letter order is 'etak'.
'etak' put within 'ring' is 'RETAKING'.

Can you help me to learn more?

I've seen this clue in The Telegraph.

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