Tory offensive about northern 'insiders (7)

I believe the answer is:

content

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''insiders' is the definition.
I can't judge whether this defines the answer.

'tory offensive about northern' is the wordplay.
'tory' becomes 'con' (abbreviation for conservative).
'offensive' becomes 'tet' (Tet Offensive, Vietnam War military campaign).
'about' is an insertion indicator.
'northern' becomes 'n' (abbreviation e.g. N. Ireland).
'tet' going around 'n' is 'tent'.
'con'+'tent'='CONTENT'

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(Other definitions for content that I've seen before include "what's included" , "Peacefully happy" , "Satisfied - subject matter" , "Satisfied - all within - capacity" , "Gist" .)

I've seen this clue in The Independent.

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