A lot to prepare for posting (6)

I believe the answer is:

parcel

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'a lot' is the definition.
(can mean a bunch or load of something)

I cannot understand how the rest of the clue works.

(Other definitions for parcel that I've seen before include "Consignment of wrapped items" , "One conveyed" , "Packet" , "Pack" , "Amount of land; package" .)

I've seen this clue in the Evening Standard.

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