Rook was forced to capture knight, giving control (4,2,4)

I believe the answer is:

take in hand

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'control' is the definition.
(thesaurus)

'rook was forced to capture knight' is the wordplay.
I cannot quite see how this works, but
'capture' could be 'take' (I've seen this before) and 'take' is found within the answer.
'knight' could be 'n' (chess abbreviation) and 'n' is present in the answer.
This explanation may well be incorrect...

'giving' is the link.

Can you help me to learn more?

I've seen this clue in The Times.

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