Crossword Genius

Cool cop more casual with us (9)

Ross

I believe the answer is:

composure

'cool' is the definition.
(thesaurus)

'cop more casual with us' is the wordplay.
'casual with' is an anagram indicator (a casual or disordered version of the letters).
'cop'+'more'='copmore'
'copmore' mixed up with 'us' makes 'COMPOSURE'.

(Other definitions for composure that I've seen before include "Self-possession" , "Calm self-control" , "Aplomb" , "Coolness" , "Calm state" .)

I've seen this clue in The Telegraph.
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