Ready to follow plot that is found in old books (8)

I believe the answer is:

obedient

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'ready to follow plot that is found in old books' is the definition.
Both the definition and answer are adjectives. Perhaps there's an association between them I don't understand?

'plot that is found in old books' is the wordplay.
'plot' becomes 'bed' (a plot of land).
'that is' becomes 'ie' (abbreviation for id est, 'that is' in Latin).
'found in' is an insertion indicator.
'old' becomes 'o' (abbreviation).
'books' becomes 'NT' (New Testament).
'bed'+'ie'='bedie'
'o'+'nt'='ont'
'bedie' placed into 'ont' is 'OBEDIENT'.

Can you help me to learn more?

(Other definitions for obedient that I've seen before include "Ready to comply" , "Passive" , "co-operative?" , "Doing what one is told, compliant" , "Ready to agree" .)

I've seen this clue in The Guardian.

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