An eight foot snooker rest? (6)

I believe the answer is:

spider

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

'snooker rest?' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for spider that I've seen before include "Insect-eater" , "Bathtub intruder - snooker rest" , "Creepy-crawly" , "Spinner" , "Prised out the 8-legged creature" .)

I've seen this clue in the Evening Standard.

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