Sentimental social media message cut short (4)
I believe the answer is:
twee
'sentimental' is the definition.
(I've seen this before)
'message cut short' is the wordplay.
'message' becomes 'tweet' (type of online message).
'cut short' means to remove the last letter.
'tweet' with its last letter taken off is 'TWEE'.
'social media' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for twee that I've seen before include "Small and sweet (colloq.)" , "Affectedly dainty or refined" , "Excessively cute" , "Affectedly dainty or quaint" , "Affectedly pretty" .)