Highly popular article everyone seethes about? (3,3,4)
I believe the answer is:
all the rage
'highly popular' is the definition.
'all the rage' can be an answer for 'popular' (I've seen this before). I'm not certain of the 'highly' bit.
'article everyone seethes about?' is the wordplay.
'article' becomes 'the' (the definite article in English).
'everyone' becomes 'all' (all people).
'seethes' becomes 'rage' (I can't explain this - if you can you should believe this answer much more).
'about?' is an insertion indicator.
'all'+'rage'='allrage'
'the' placed inside 'allrage' is 'ALL THE RAGE'.
Can you help me to learn more?
(Other definitions for all the rage that I've seen before include "ultra-fashionable" , "Fashionable" , "in vogue?" , "Extremely popular" , "Very much in fashion" .)