Canvas creator’s realism somehow capturing a king (9)

I believe the answer is:

sailmaker

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

'canvas creator's' is the definition.
'sailmaker' can be an answer for 'creator's' (sailmaker is a kind of creator). I'm not sure about the 'canvas' bit.

'realism somehow capturing a king' is the wordplay.
'somehow' is an anagram indicator.
'capturing' indicates putting letters inside.
'king' becomes 'K' (abbreviation for king in chess).
'realism' with letters rearranged gives 'sailmer'.
'a'+'k'='ak'
'sailmer' placed around 'ak' is 'SAILMAKER'.

Can you help me to learn more?

I've seen this clue in The Times.

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