As usual, dressed as an army scout (9)

I believe the answer is:

customary

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'as usual' is the definition.
(I've seen this before)

'dressed as an army scout' is the wordplay.
'army scout' anagrams to 'CUSTOMARY'.
However, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for customary that I've seen before include "Courts may find this usual" , "According to usual practice" , "Habitual, usual" , "precedent" , "In accordance with convention" .)

I've seen this clue in the Evening Standard.

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