Remark of reader not getting in a state (10)

I believe the answer is:

annotation

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'remark of reader' is the definition.
'annotation' can be an answer for 'remark' (thesaurus). I'm unsure of the 'of reader' bit.

'not getting in a state' is the wordplay.
'getting in' indicates putting letters inside.
'state' becomes 'nation' (both can mean a country).
'a'+'nation'='anation'
'not' going inside 'anation' is 'ANNOTATION'.

Can you help me to learn more?

(Other definitions for annotation that I've seen before include "The adding of notes to a text" , "Comment" , "Explanatory added notes" .)

I've seen this clue in The Times.

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