Lacking energy and ill-prepared for shopping? (8)

I believe the answer is:

listless

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'lacking energy' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

(Other definitions for listless that I've seen before include "Short of energy (and ill-equipped for shopping?)" , "Lacking energy or interest" , "Lacking energy or vitality" , "Devoid of energy or concern" , "Languid - apathetic" .)

I've seen this clue in The Times.

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