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Offensive
in
the
armed
forces?
(7)
Offensive in the armed forces? (7)
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The whole clue is the definition (& lit or double definition).
How the clue works
This is a double definition where Offensive means rude or discourteous, matching UNCIVIL directly. The second reading, in the armed forces?, playfully suggests being not civilian (un-civil), i.e. military, also pointing to UNCIVIL.