Try going viral - it's very upsetting (5-7)
I believe the answer is:
heart-rending
'upsetting' is the definition.
(I've seen this before)
'try going' is the wordplay.
'try' becomes 'hear' (as in to try someone in court or hear their case).
'going' becomes 'trending' (I can't explain this - if you can you should believe this answer much more).
'hear'+'trending'='HEART-RENDING'
'viral it's very' is the link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for heart-rending that I've seen before include "Causing great sadness or distress" , "Greatly distressing" , "Poignant" , "moving" , "Agonisingly sad" .)