Soldiers do it, showing aggression towards the fuddy-duddy (6-7)

I believe the answer is:

square-bashing

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'soldiers do it' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

(Other definitions for square-bashing that I've seen before include "Military drill (informal)" , "Parade ground drill" , "Parade-ground drill" .)

I've seen this clue in The Times.

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