"Misspeak" about new policy (4)

I believe the answer is:

line

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'policy' is the definition.
(as in the party line)

'misspeak about new' is the wordplay.
'misspeak' becomes 'lie' (I can't explain this - if you can you should believe this answer much more).
'about' indicates putting letters inside.
'new' becomes 'n' (abbreviation as in New Testament NT).
'lie' going around 'n' is 'LINE'.

Can you help me to learn more?

(Other definitions for line that I've seen before include "Long narrow mark" , "column" , "(Skin) wrinkle; limit" , "business" , "classified information" .)

I've seen this clue in The Independent.

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