The brass hat is not particular (7)

I believe the answer is:

general

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'not particular' is the definition.
(I've seen this in another clue)

I don't understand the rest of the clue.

(Other definitions for general that I've seen before include "Rank; all-inclusive" , "High ranking officer" , "top brass" , "Rank; normal, usual" , "Enlarge for senior army officer" .)

I've seen this clue in The Irish Independent.

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