Artist is too cruel, represented with no end of hope (9)

I believe the answer is:

colourist

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'artist' is the definition.
(type of artist)

'is too cruel represented with no end of hope' is the wordplay.
I cannot quite see how this works, but
'is' is within the answer.
'no' could be 'o' (resembles 0 - 'no' can mean 'zero') and 'o' is located in the answer.
'of' could be 'o' and 'o' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Telegraph.

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