Flip charts showing flood with unwanted info (4)
I believe the answer is:
spam
'flood with unwanted info' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'flip charts' is the wordplay.
'flip' shows that the letters should be reversed in order.
'charts' becomes 'maps' ('map' can be a synonym of 'chart').
'maps' back-to-front is 'SPAM'.
'showing' acts as a link.
Can you help me to learn more?
(Other definitions for spam that I've seen before include "net on junk? On the contrary" , "(Send) junk mail" , "canned meat" , "Thoughtlessly send" , "Junk email" .)