Frank’s championship? (4)

I believe the answer is:

open

I believe this is a double definition.

'frank's' is the first definition.
('open' can be a synonym of 'frank')

'championship?' is the second definition.
(I've seen this before)

(Other definitions for open that I've seen before include "Frank and unconcealed" , "Widely known" , "Plain" , "Eager to receive" , "Public" .)

I've seen this clue in the Evening Standard.

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