Catch sight of article and be very agitated (6)
I believe the answer is:
seethe
'be very agitated' is the definition.
(I've seen this in another clue)
'catch sight of article' is the wordplay.
'catch sight of' becomes 'see' (I've seen this in another clue).
'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; be intensely angry" , "Boil; be crowded with moving people" , "Bubble, almost boil" , "Boil or become very angry" , "(Of liquid) boil" .)