Outspoken cleric shot in the billiard room (6)

I believe the answer is:

cannon

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'shot in the billiard room' is the definition.
'cannon' can be an answer for 'shot' (cannon is a kind of shot). I am not sure about the 'in the billiard room' bit.

'outspoken cleric' is the wordplay.
'outspoken' shows a homophone (sound like) (as the word might be spoken).
'cleric' becomes 'canon' (I've seen this before).
'canon' is a homophone of 'CANNON'.

Can you help me to learn more?

(Other definitions for cannon that I've seen before include "Large gun mounted on wheels" , "Big gun" , "Heavy ordnance" , "Howitzer" , "Wheeled guns" .)

I've seen this clue in The Times and The Sunday Times.

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