Crossword Genius

Knock out with a snooker cue? (4)

Ross

I believe the answer is:

stun

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

This clue could be a double definition.

'knock out' is the first definition.
(I've seen this before)

'snooker cue?' is the second definition.
Although both the answer and definition are verbs in their base form, I don't understand how one could define the other.

'with a' acts as a link.

Can you help me to learn more?

(Other definitions for stun that I've seen before include "'Shock, daze (4)'" , "Stagger, amaze" , "Take aback" , "Shock into silence" , "Knock unconscious" .)

I've seen this clue in the Evening Standard.
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