Crossword Genius

Scouts, as a rule, messed up part of basic training (7,6)

Ross

I believe the answer is:

assault course

'part of basic training' is the definition.
(exercise training)

'scouts as a rule messed up' is the wordplay.
'messed up' indicates anagramming the letters.
'scouts'+'as'+'a'+'rule'='scoutsasarule'
'scoutsasarule' anagrammed gives 'ASSAULT COURSE'.

(Other definitions for assault course that I've seen before include "Test of fitness and endurance" , "Training exercise (mil.)" , "Arduous training for soldiers" , "for cadets in training?" , "Soldier training circuit" .)

I've seen this clue in The Times.
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