Cute social media post cut (4)
I believe the answer is:
twee
'cute' is the definition.
(I've seen this before)
'social media post cut' is the wordplay.
'social media post' becomes 'tweet' (post on twitter).
'cut' means to remove the last letter.
'tweet' with its last letter taken off is 'TWEE'.
(Other definitions for twee that I've seen before include "Mawkish" , "Excessively sentimental" , "Excessively pretty" , "Overly precious" , "Affectedly dainty or refined" .)