Crossword Genius

Military arm (3,5)

Ross

I think it could be either:

Which length description are you looking for?:

8

3,5

air force

(Other definitions for air force that I've seen before include "one of the services" , "Simple tune for church service" , "Armed service" , "Country's military planes" , "Kind of blue" .)

I've seen this clue in The Mirror.
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