Cue-rests for eight-footers! (7)

I believe the answer is:

spiders

I'm a little stuck... Click here to teach me more about this clue!

'eight-footers' is the definition.
(I've seen this in another clue)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for spiders that I've seen before include "14 [BOWIE] 's band from 26 [MARS]" , "Web weavers" , "Insects; rests" , "Predators on the web" , "Arachnids" .)

I've seen this clue in The Irish Independent.

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