Quickly heart someone's Instagram post (4,1,4)
I believe the answer is:
like a shot
'instagram post' is the definition.
I don't know anything about this answer so I can't judge whether this works.
'quickly heart someone's' is the wordplay.
I cannot quite see how this works, but
'heart' could be 'h' (card game abbreviation) and 'h' is located in the answer.
'someone' could be 'sot' (sot is a kind of someone) and 'sot' is located in the leftover letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for like a shot that I've seen before include "Bally" , "looking round, in field event?" , "What serious drinkers do" , "Enjoy field sports" , "'Pronto!'" .)