Sentimental, short message on social medium (4)
I believe the answer is:
twee
'sentimental' is the definition.
(I've seen this before)
'short message on social medium' is the wordplay.
I cannot quite understand how this works, but
'short' could be 'wee' (I've seen this in other clues) and 'wee' is found within the answer.
A single letter 't' remains which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for twee that I've seen before include "Affectedly dainty or refined" , "rather quaint" , "Small and sweet (colloq.)" , "Sickly sweet" , "Affectedly sweet" .)