Noisily change focal point of service (5)

I believe the answer is:

altar

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'focal point of service' is the definition.
I can't tell whether this defines the answer.

'noisily change' is the wordplay.
'noisily' shows a homophone (sound like).
'change' becomes 'alter' (altering is a kind of changing).
'alter' sounds like 'ALTAR'.

Can you help me to learn more?

(Other definitions for altar that I've seen before include "Site of worship" , "Table for sacrifice" , "Part of church" , "Sacrificial table" , "place of unions" .)

I've seen this clue in The Times.

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