Delight after Twitter's back -- send link (12)
I believe the answer is:
relationship
'link' is the definition.
(thesaurus)
'delight after twitter's back send' is the wordplay.
'delight' becomes 'elation' (I've seen this before).
'after' is a charade indicator (letters next to each other).
'back' says to take the final letters.
'send' becomes 'ship' (to send overseas).
The final letter of 'twitter' is 'r'.
'elation' put after 'r' is 'relation'.
'relation'+'ship'='RELATIONSHIP'
(Other definitions for relationship that I've seen before include "Intimate affair" , "Connection, bond" , "Linkage; affair" , "Romance" , "Emotional bond" .)