The best, but it's breakable (6)

I believe the answer is:

record

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'the best' is the definition.
(eg record profits)

I don't understand how the rest of the clue works.

(Other definitions for record that I've seen before include "Written report - best so far!" , "It may get broken" , "Written account (none better!)" , "Tape" , "Register, chronicle" .)

I've seen this clue in the Evening Standard.

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