Ring round to find a source of entertainment (5)

I believe the answer is:

disco

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'entertainment' is the definition.
(I have seen 'Musical entertainment' mean 'disco' so perhaps 'entertainment' could also mean 'disco')

'ring round to find a source of' is the wordplay.
'ring round' becomes 'disc' (both are round objects. I am not sure about the 'round' bit.).
'to find' means one lot of letters go next to another.
'a source' says to take the initial letters (I've seen 'source of' mean this).
The initial letter of 'of' is 'o'.
'disc'+'o'='DISCO'

Can you help me to learn more?

(Other definitions for disco that I've seen before include "Style of music/dancing" , "Doc is dancing here" , "Club with dancing to recorded music" , "Dancehall with recorded music, in short" , "Nightclub with dancing to recorded music" .)

I've seen this clue in the Evening Standard.

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