Cheese with split, in short (7)

I believe the answer is:

briefly

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'in short' is the definition.
(synonyms)

'cheese with split' is the wordplay.
'cheese' becomes 'brie' (Brie is an example).
'with split' becomes 'fly' (I am not sure about this - if you are sure you should believe this answer much more).
'brie'+'fly'='BRIEFLY'

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(Other definitions for briefly that I've seen before include "In a nutshell" , "For a short time" , "Cursorily" , "In a few words" , "Fleetingly" .)

I've seen this clue in The Daily Express.

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