Notice article boil (6)
I believe the answer is:
seethe
'boil' is the definition.
(I know that boil can be written as seethe)
'notice article' is the wordplay.
'notice' becomes 'see' (notice can mean to spot or see).
'article' becomes 'the' (the definite article in English).
'see'+'the'='SEETHE'
(Other definitions for seethe that I've seen before include "Boil; be intensely angry" , "'Boil, with anger perhaps (6)'" , "become agitated" , "Feel intense rage" , "(Of liquid) boil" .)