When things are quiet, write a third of a column for £50 (4)

I believe the answer is:

lull

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If this is the answer I cannot explain how the clue works.

(Other definitions for lull that I've seen before include "A calm period as in a storm" , "Hiatus or respite" , "A temporary period of quiet, as in storm" , "A temporary pause as in storm" , "Calm; allay (fears)" .)

I've seen this clue in the Evening Standard.

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