Sound made by entry: one short ring (7)

I believe the answer is:

logical

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'sound' is the definition.
(I've seen this in another clue)

'entry one short ring' is the wordplay.
'entry one' becomes 'logi' (I can't justify this - if you can you should believe this answer much more).
'short' means to remove the last letter.
'ring' becomes 'call' (call on the phone).
'call' with its final letter taken off is 'cal'.
'logi'+'cal'='LOGICAL'

'made by' acts as a link.

Can you help me to learn more?

(Other definitions for logical that I've seen before include "Using reason" , "Following correct reasoning" , "Correctly thought out" , "According with reason" , "Sound" .)

I've seen this clue in The Times.

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