To ring excessively (3)

I believe the answer is:

too

'excessively' is the definition.
(synonyms)

'to ring' is the wordplay.
'ring' becomes 'o' ().
'to'+'o'='TOO'

(Other definitions for too that I've seen before include "What a pity!" , "To a greater than desirable extent" , "As well, also" , "Excessively" , "Additionally" .)

I've seen this clue in The Globe and Mail.

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