A billiard shot to queue up for? (5)

I believe the answer is:

masse

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'a billiard shot' is the definition.
'masse' can be an answer for 'shot' (masse is a kind of shot). I'm unsure of the 'a billiard' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for masse that I've seen before include "Swerve shot at billiards" , "Swerving snooker stroke" , "'En ..., all together (5)'" .)

I've seen this clue in the Evening Standard.

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