Arrogant police officer, one facing other ranks (8)
I believe the answer is:
superior
'arrogant' is the definition.
(thesaurus)
'police officer one facing other ranks' is the wordplay.
'police officer' becomes 'super' (term for a senior police officer).
'one' becomes 'i' (Roman numeral).
'facing' means one lot of letters go next to another.
'other ranks' becomes 'or' (military abbreviation).
'super'+'i'+'or'='SUPERIOR'
(Other definitions for superior that I've seen before include "One of higher rank" , "Senior in rank" , "A better boss?" , "Better than, in a higher class" , "Haughty" .)