Black widow on the snooker table? (6)

I believe the answer is:

spider

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

'black widow' is the definition.
(I've seen this in another clue)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for spider that I've seen before include "Webster" , "Web expert?" , "Snooker-cue rest" , "Eight-legged webmaster?" , "Web developer" .)

I've seen this clue in the Evening Standard.

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