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Way defence ministry covers the unexpected (6)

Ross

I believe the answer is:

method

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'way' is the definition.
(method is a kind of way)

I cannot understand how the remainder of the clue works.

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(Other definitions for method that I've seen before include "System (of acting?)" , "Procedure or system" , "Manner, technique" , "Process, esp. Stanislavsky's" , "Tidy way of doing things" .)

I've seen this clue in The Sun and The Times.
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