Doing nothing but fighting? (8)

I believe the answer is:

inaction

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'doing nothing' is the definition.
(I've seen this before)

'but fighting?' is the wordplay.
'but' becomes 'in' (I am not sure about this - if you are sure you should believe this answer much more).
'fighting?' becomes 'action' (as in military action).
'in'+'action'='INACTION'

Can you help me to learn more?

(Other definitions for inaction that I've seen before include "Immobility" , "Ionic tan (anag.)" , "Rest" , "Passivity, doing nothing" , "Idleness - fighting" .)

I've seen this clue in The Globe and Mail.

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