Extravagantly dine on things: this could just go on and on (2,3,2,5)
I believe the answer is:
no end in sight
'could just go on and on' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.
'extravagantly dine on things' is the wordplay.
'extravagantly' is an anagram indicator (an unusual or extravagant version of the letters).
'dine'+'on'+'things'='dineonthings'
'dineonthings' is an anagram of 'NO END IN SIGHT'.
'this' acts as a link.
Can you help me to learn more?
(Another definition for no end in sight that I've seen is " Lack of resolution so far".)