Hackneyed collection of jottings? (11,4)

I believe the answer is:

commonplace book

'collection of jottings?' is the definition.

I cannot understand how the rest of the clue works.

(Other definitions for commonplace book that I've seen before include "cuttings collection" , "Snippets collected" , "assembly of quality extraction" , "for jottings" , "one may be full of memorable sayings" .)

I've seen this clue in The Guardian.

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