Crossword Genius

Possibly uppermost in arrogance (11)

Ross

I believe the answer is:

presumption

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

'possibly uppermost in' is the wordplay.
'possibly' indicates an anagram.
'uppermost'+'in'='uppermostin'
'uppermostin' with letters rearranged gives 'PRESUMPTION'.

(Other definitions for presumption that I've seen before include "Arrogance" , "Supposition - impertinence" .)

I've seen this clue in The Globe and Mail and The Telegraph.
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