Nick Knowles ultimately accepting 3 contracts (10)

I believe the answer is:

indentures

I'm a little stuck... Click here to teach me more about this clue!

'contracts' is the definition.
(indenture is a kind of contract)

'nick knowles ultimately accepting 3' is the wordplay.
I cannot really see how this works, but
'nick' could be 'dent' (synonyms) and 'dent' is present in the answer.
The remaining letters 'inures' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Independent.

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