Crossword Genius

Dressed for a military operation, we hear (7)

Ross

I believe the answer is:

arrayed

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

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

'military operation we hear' is the wordplay.
'military' becomes 'ar' (I am not sure about this - if you are sure you should believe this answer much more).
'operation' becomes 'raid' (raid is a kind of operation).
'we hear' shows a homophone (sound like).
'raid' sounds like 'rayed'.
'ar'+'rayed'='ARRAYED'

'for a' is the link.

Can you help me to learn more?

(Other definitions for arrayed that I've seen before include "Ordered" , "Formed up" , "Decoratively assembled" , "Marshalled; (finely) dressed" , "Displayed in an arrangement" .)

I've seen this clue in The Guardian.
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