Change sketch of jailer after reflection (6)

I believe the answer is:

redraw

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'change sketch' is the definition.
'redraw' can be an answer for 'change' (I've seen this before). I'm not certain of the 'sketch' bit.

'jailer after reflection' is the wordplay.
'jailer' becomes 'warder' (I've seen this before).
'after reflection' is a reversal indicator.
'warder' backwards is 'REDRAW'.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for redraw that I've seen before include "Change" , "Sketch again" , "Design again" , "Find a new winner" , "Delineate again" .)

I've seen this clue in The Guardian.

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