After no peace I head for caution (8)

I believe the answer is:

wariness

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'for caution' is the definition.
(wariness is a kind of caution)

'after no peace i head' is the wordplay.
'after no peace' becomes 'war' (I can't justify this - if you can you should give a lot more credence to this answer).
'head' becomes 'ness' (ness is a headland).
'war'+'i'+'ness'='WARINESS'

Can you help me to learn more?

(Other definitions for wariness that I've seen before include "State of caution" , "Caution, watchfulnes" , "Circumspection" .)

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

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