Awfully good dinner ... what ... what will the sticky bits left on the plates do? (2,4,3,5)
I believe the answer is:
go down the drain
'will the sticky bits left on the plates do?' is the definition.
I don't know anything about this answer so I can't judge whether this works.
'awfully good dinner what' is the wordplay.
'awfully' indicates an anagram.
'good'+'dinner'+'what'='gooddinnerwhat'
'gooddinnerwhat' is an anagram of 'GO DOWN THE DRAIN'.
'what' acts as a link.
Can you help me to learn more?
(Other definitions for go down the drain that I've seen before include "Run away" , "Sink into oblivion" , "be wholly unprofitable" , "be of no use?" , "as failures might?" .)