Shells (4)

I think it could be either:

Which length description are you looking for?:

ammo

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

This is all the clue.

(Other definitions for ammo that I've seen before include "eg Bullets, shells" , "Bullets, shells, rockets etc" , "essential supplies for soldiers" , "Shot" , "Bullets, shells (colloq.)" .)

I've seen this clue in the Penny Press.

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