Message from over-sentimental time (5)

I believe the answer is:

'message' is the definition.
(type of online message)

'over-sentimental time' is the wordplay.
'over-sentimental' becomes 'twee'.
'time' becomes 't' (abbreviation).
'twee'+'t'='TWEET'

'from' is the link.

(Other definitions for tweet that I've seen before include "Message from Trump?" , "Brief message" , "Note of a small bird" , "Online communication" , "Short online message" .)

I've seen this clue in The Times.

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