Where shelf stackers may be seen, everywhere (3,4,3,4)

I believe the answer is:

all over the shop

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

I can't explain the rest of the clue.

(Other definitions for all over the shop that I've seen before include "as an overworked storekeeper may be?" , "Like massive clearance-sale offers" , "in lots of areas" , "higgledy-piggledy" , "everywhere" .)

I've seen this clue in The Telegraph.

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