Unprepared for possible war (3)

I believe the answer is:

raw

I'm a little stuck... Click here to teach me more about this clue!

'unprepared' is the definition.
(I've seen this in another clue)

'possible war' is the wordplay.
'war' can be anagrammed to 'RAW'.
However, I'm not clear how the anagram is indicated.

'for' is the link.

Can you help me to learn more?

(Other definitions for raw that I've seen before include "Unrefined" , "not manufactured" , "Uncooked or unsophisticated" , "Unpleasantly cold and damp" , "Uncooked; immature" .)

I've seen this clue in The Mirror.

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