Understand article and be furious (6)
I believe the answer is:
seethe
'be furious' is the definition.
(to seethe is to be very angry)
'understand article' is the wordplay.
'understand' becomes 'see' (synonyms).
'article' becomes 'the' (the definite article in English).
'see'+'the'='SEETHE'
'and' is the link.
(Other definitions for seethe that I've seen before include "Boil turbulently" , "Feel intense rage" , "become agitated" , "Barely contain one's anger" , "'Boil, with anger perhaps (6)'" .)