Shape the hair at warfare (6)

I believe the answer is:

combat

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

'warfare' is the definition.
(I've seen this before)

'shape the hair at' is the wordplay.
'shape the hair' becomes 'comb' (I can't justify this - if you can you should believe this answer much more).
'comb'+'at'='COMBAT'

Can you help me to learn more?

(Other definitions for combat that I've seen before include "A fight or contest, sometimes mortal" , "Fight, struggle or contest" , "Oppose" , "War; contest" , "Fight or contest, may be mortal" .)

I've seen this clue in the Sydney Morning Herald.

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